diff --git a/lfs.c b/lfs.c
index 92d9531a..54350e35 100644
--- a/lfs.c
+++ b/lfs.c
@@ -8188,8 +8188,8 @@ static inline bool lfsr_t_isckmeta(uint32_t flags) {
     return flags & LFS_T_CKMETA;
 }
 
-static inline bool lfsr_t_isckdata(uint32_t flags) {
-    return flags & LFS_T_CKDATA;
+static inline bool lfsr_t_isck(uint32_t flags) {
+    return flags & LFS_T_CK;
 }
 
 static inline bool lfsr_f_isdirty(uint32_t flags) {
@@ -8497,7 +8497,7 @@ static int lfsr_mtree_traverse(lfs_t *lfs,
     }
 
     // validate btree nodes? note mdirs are already validated
-    if (lfsr_t_isckmeta(mt->flags)
+    if ((lfsr_t_isckmeta(mt->flags) || lfsr_t_isck(mt->flags))
             && mtinfo->tag == LFSR_TAG_BRANCH) {
         err = lfsr_rbyd_fetchck(lfs, &mtinfo->u.rbyd,
                 mtinfo->u.rbyd.blocks[0], mtinfo->u.rbyd.trunk,
@@ -8508,7 +8508,7 @@ static int lfsr_mtree_traverse(lfs_t *lfs,
     }
 
     // validate data blocks?
-    if (lfsr_t_isckdata(mt->flags)
+    if (lfsr_t_isck(mt->flags)
             && mtinfo->tag == LFSR_TAG_BLOCK) {
         err = lfsr_bptr_ck(lfs, &mtinfo->u.bptr);
         if (err) {
@@ -12576,7 +12576,7 @@ int lfsr_traversal_open(lfs_t *lfs, lfsr_traversal_t *t, uint32_t flags) {
     LFS_ASSERT(!lfsr_omdir_isopen(lfs, &t->o));
     // some flags don't make sense when only traversing the mtree
     LFS_ASSERT(!lfsr_t_ismtreeonly(flags) || !lfsr_t_islookahead(flags));
-    LFS_ASSERT(!lfsr_t_ismtreeonly(flags) || !lfsr_t_isckdata(flags));
+    LFS_ASSERT(!lfsr_t_ismtreeonly(flags) || !lfsr_t_isck(flags));
     // these flags are internal and shouldn't be provided by the user
     LFS_ASSERT(!lfsr_f_isdirty(flags));
 
diff --git a/lfs.h b/lfs.h
index 6ea16dd2..042a6ebd 100644
--- a/lfs.h
+++ b/lfs.h
@@ -174,10 +174,10 @@ enum lfs_traversal_flags {
     LFS_T_LOOKAHEAD     = 0x0040, // Populate lookahead buffer
     LFS_T_COMPACT       = 0x0080, // Compact metadata logs
     LFS_T_CKMETA        = 0x0100, // Check metadata checksums
-    LFS_T_CKDATA        = 0x0200, // Check data checksums
+    LFS_T_CK            = 0x0200, // Check metadata + data checksums
 // TODO
 //    LFS_T_REPAIRMETA    = 0x0400, // Repair metadata blocks
-//    LFS_T_REPAIRDATA    = 0x0800, // Repair data blocks
+//    LFS_T_REPAIR        = 0x0800, // Repair metadata + data blocks
 
     // internally used flags
     LFS_F_DIRTY         = 0x1000, // Filesystem has been modified
diff --git a/tests/test_traversal.toml b/tests/test_traversal.toml
index 6af9b95e..c0f0efc1 100644
--- a/tests/test_traversal.toml
+++ b/tests/test_traversal.toml
@@ -10,7 +10,7 @@ after = [
 # a simple traversal test
 [cases.test_traversal_simple]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 code = '''
     lfs_t lfs;
@@ -21,7 +21,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
     struct lfs_tinfo tinfo;
     lfsr_traversal_read(&lfs, &t, &tinfo) => 0;
@@ -39,7 +39,7 @@ code = '''
 # can we rewind?
 [cases.test_traversal_rewind]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 code = '''
     lfs_t lfs;
@@ -50,7 +50,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
     struct lfs_tinfo tinfo;
     lfsr_traversal_read(&lfs, &t, &tinfo) => 0;
@@ -77,7 +77,7 @@ code = '''
 # test that we don't get extra anything after end of traversal
 [cases.test_traversal_idempotent]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 code = '''
     lfs_t lfs;
@@ -88,7 +88,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
     struct lfs_tinfo tinfo;
     lfsr_traversal_read(&lfs, &t, &tinfo) => 0;
@@ -117,7 +117,7 @@ code = '''
 [cases.test_traversal_clobber_dirs]
 defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 code = '''
     lfs_t lfs;
     lfsr_format(&lfs, CFG) => 0;
@@ -137,7 +137,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)) => 0;
+                | ((CK) ? LFS_T_CK : 0)) => 0;
     for (lfs_block_t i = 0;; i++) {
         // a bit hacky, but this catches infinite loops
         assert(i < 2*BLOCK_COUNT);
@@ -226,7 +226,7 @@ defines.SIZE = [
     '8*BLOCK_SIZE',
 ]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 if = '(SIZE*N)/BLOCK_SIZE <= 32'
 code = '''
     lfs_t lfs;
@@ -258,7 +258,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)) => 0;
+                | ((CK) ? LFS_T_CK : 0)) => 0;
     for (lfs_block_t i = 0;; i++) {
         // a bit hacky, but this catches infinite loops
         assert(i < 2*BLOCK_COUNT);
@@ -341,7 +341,7 @@ defines.SIZE = [
     '8*BLOCK_SIZE',
 ]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 if = '(SIZE*N)/BLOCK_SIZE <= 32'
 code = '''
     lfs_t lfs;
@@ -372,7 +372,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)) => 0;
+                | ((CK) ? LFS_T_CK : 0)) => 0;
     for (lfs_block_t i = 0;; i++) {
         // a bit hacky, but this catches infinite loops
         assert(i < 2*BLOCK_COUNT);
@@ -468,7 +468,7 @@ code = '''
 [cases.test_traversal_rewind_clobber_dirs]
 defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256, 512]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 code = '''
     lfs_t lfs;
     lfsr_format(&lfs, CFG) => 0;
@@ -488,7 +488,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)) => 0;
+                | ((CK) ? LFS_T_CK : 0)) => 0;
     lfs_block_t r = 0;
     for (lfs_block_t i = 0;; i++) {
         // a bit hacky, but this catches infinite loops
@@ -586,7 +586,7 @@ defines.SIZE = [
     '8*BLOCK_SIZE',
 ]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 if = '(SIZE*N)/BLOCK_SIZE <= 32'
 code = '''
     lfs_t lfs;
@@ -618,7 +618,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)) => 0;
+                | ((CK) ? LFS_T_CK : 0)) => 0;
     lfs_block_t r = 0;
     for (lfs_block_t i = 0;; i++) {
         // a bit hacky, but this catches infinite loops
@@ -710,7 +710,7 @@ defines.SIZE = [
     '8*BLOCK_SIZE',
 ]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 if = '(SIZE*N)/BLOCK_SIZE <= 32'
 code = '''
     lfs_t lfs;
@@ -741,7 +741,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)) => 0;
+                | ((CK) ? LFS_T_CK : 0)) => 0;
     lfs_block_t r = 0;
     for (lfs_block_t i = 0;; i++) {
         // a bit hacky, but this catches infinite loops
@@ -928,7 +928,7 @@ defines.SIZE = [
     '8*BLOCK_SIZE',
 ]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 if = '(SIZE*N)/BLOCK_SIZE <= 32'
 code = '''
     for (lfs_block_t i = 0;; i += 2) {
@@ -1024,7 +1024,7 @@ defines.SIZE = [
     '8*BLOCK_SIZE',
 ]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 if = '(SIZE*N)/BLOCK_SIZE <= 32'
 code = '''
     for (lfs_block_t i = 0;; i += 2) {
@@ -1200,7 +1200,7 @@ defines.SIZE = [
     '8*BLOCK_SIZE',
 ]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 if = '(SIZE*N)/BLOCK_SIZE <= 32'
 code = '''
     for (lfs_block_t i = 0;; i++) {
@@ -1294,7 +1294,7 @@ defines.SIZE = [
     '8*BLOCK_SIZE',
 ]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 if = '(SIZE*N)/BLOCK_SIZE <= 32'
 code = '''
     for (lfs_block_t i = 0;; i++) {
@@ -1438,7 +1438,7 @@ code = '''
 
     clobbered:;
         // traverse again, we should detect the clobbered metadata
-        lfsr_traversal_open(&lfs, &t, LFS_T_CKDATA) => 0;
+        lfsr_traversal_open(&lfs, &t, LFS_T_CK) => 0;
         for (lfs_block_t j = 0;; j++) {
             assert(j < 2*BLOCK_COUNT);
 
@@ -1469,7 +1469,7 @@ defines.SIZE = [
     '8*BLOCK_SIZE',
 ]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 if = '(SIZE*N)/BLOCK_SIZE <= 32'
 code = '''
     for (lfs_block_t i = 0;; i++) {
@@ -1533,7 +1533,7 @@ code = '''
 
     clobbered:;
         // traverse again, we should detect the clobbered metadata
-        lfsr_traversal_open(&lfs, &t, LFS_T_CKDATA) => 0;
+        lfsr_traversal_open(&lfs, &t, LFS_T_CK) => 0;
         for (lfs_block_t j = 0;; j++) {
             assert(j < 2*BLOCK_COUNT);
 
@@ -1564,7 +1564,7 @@ defines.SIZE = [
     '8*BLOCK_SIZE',
 ]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 if = '(SIZE*N)/BLOCK_SIZE <= 32'
 code = '''
     for (lfs_block_t i = 0;; i++) {
@@ -1630,7 +1630,7 @@ code = '''
 
     clobbered:;
         // traverse again, we should detect the clobbered metadata
-        lfsr_traversal_open(&lfs, &t, LFS_T_CKDATA) => 0;
+        lfsr_traversal_open(&lfs, &t, LFS_T_CK) => 0;
         for (lfs_block_t j = 0;; j++) {
             assert(j < 2*BLOCK_COUNT);
 
@@ -1659,7 +1659,7 @@ done:;
 [cases.test_traversal_mutation]
 defines.WHEN = [0, 1, 2]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 code = '''
     lfs_t lfs;
@@ -1670,7 +1670,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     if (WHEN == 0) {
@@ -1717,7 +1717,7 @@ done:;
 [cases.test_traversal_mutation_excl]
 defines.WHEN = [0, 1, 2]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 code = '''
     lfs_t lfs;
@@ -1729,7 +1729,7 @@ code = '''
     lfsr_traversal_open(&lfs, &t,
             LFS_T_EXCL
                 | ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     if (WHEN == 0) {
@@ -1785,7 +1785,7 @@ done:;
 # test that we don't get extra anything after end of traversal
 [cases.test_traversal_mutation_idempotent]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 code = '''
     lfs_t lfs;
@@ -1796,7 +1796,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
     struct lfs_tinfo tinfo;
     lfsr_traversal_read(&lfs, &t, &tinfo) => 0;
@@ -1837,7 +1837,7 @@ code = '''
 
 [cases.test_traversal_mutation_excl_idempotent]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 code = '''
     lfs_t lfs;
@@ -1849,7 +1849,7 @@ code = '''
     lfsr_traversal_open(&lfs, &t,
             LFS_T_EXCL
                 | ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
     struct lfs_tinfo tinfo;
     lfsr_traversal_read(&lfs, &t, &tinfo) => 0;
@@ -1892,7 +1892,7 @@ code = '''
 defines.WHEN = [0, 1, 2]
 defines.EXCL = [false, true]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 code = '''
     lfs_t lfs;
@@ -1904,7 +1904,7 @@ code = '''
     lfsr_traversal_open(&lfs, &t,
             ((EXCL) ? LFS_T_EXCL : 0)
                 | ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     if (WHEN == 0) {
@@ -1964,7 +1964,7 @@ done:;
 defines.WHEN = [0, 1, 2]
 defines.EXCL = [false, true]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 code = '''
     lfs_t lfs;
@@ -1982,7 +1982,7 @@ code = '''
     lfsr_traversal_open(&lfs, &t,
             ((EXCL) ? LFS_T_EXCL : 0)
                 | ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     if (WHEN == 0) {
@@ -2042,7 +2042,7 @@ done:;
 defines.WHEN = [0, 1, 2]
 defines.EXCL = [false, true]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 code = '''
     lfs_t lfs;
@@ -2060,7 +2060,7 @@ code = '''
     lfsr_traversal_open(&lfs, &t,
             ((EXCL) ? LFS_T_EXCL : 0)
                 | ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     if (WHEN == 0) {
@@ -2120,7 +2120,7 @@ done:;
 [cases.test_traversal_mutation_fwrite]
 defines.EXCL = [false, true]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = [
     'FILE_BUFFER_SIZE/2',
@@ -2153,7 +2153,7 @@ code = '''
     lfsr_traversal_open(&lfs, &t,
             ((EXCL) ? LFS_T_EXCL : 0)
                 | ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     while (true) {
@@ -2193,7 +2193,7 @@ code = '''
 [cases.test_traversal_mutation_fwrite_open]
 defines.EXCL = [false, true]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = [
     'FILE_BUFFER_SIZE/2',
@@ -2229,7 +2229,7 @@ code = '''
     lfsr_traversal_open(&lfs, &t,
             ((EXCL) ? LFS_T_EXCL : 0)
                 | ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     while (true) {
@@ -2280,7 +2280,7 @@ code = '''
 #
 [cases.test_traversal_mutation_file_bsprout]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = 'FILE_BUFFER_SIZE/2'
 defines.TRUNC = [false, true]
@@ -2315,7 +2315,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -2358,7 +2358,7 @@ code = '''
 
 [cases.test_traversal_mutation_file_btree]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 defines.INLINE_SIZE = 0
@@ -2394,7 +2394,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -2443,7 +2443,7 @@ code = '''
 
 [cases.test_traversal_mutation_file_bshrub]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 defines.TRUNC = [false, true]
@@ -2478,7 +2478,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -2524,7 +2524,7 @@ code = '''
 
 [cases.test_traversal_mutation_orphan_bsprout]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = 'FILE_BUFFER_SIZE/2'
 code = '''
@@ -2557,7 +2557,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -2601,7 +2601,7 @@ code = '''
 
 [cases.test_traversal_mutation_orphan_btree]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 defines.INLINE_SIZE = 0
@@ -2635,7 +2635,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -2693,7 +2693,7 @@ code = '''
 
 [cases.test_traversal_mutation_orphan_bshrub]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 code = '''
@@ -2726,7 +2726,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -2773,7 +2773,7 @@ code = '''
 
 [cases.test_traversal_mutation_close_bsprout]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = 'FILE_BUFFER_SIZE/2'
 defines.DESYNC = [false, true]
@@ -2807,7 +2807,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -2854,7 +2854,7 @@ code = '''
 
 [cases.test_traversal_mutation_close_btree]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 defines.INLINE_SIZE = 0
@@ -2889,7 +2889,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -2952,7 +2952,7 @@ code = '''
 
 [cases.test_traversal_mutation_close_bshrub]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 defines.DESYNC = [false, true]
@@ -2986,7 +2986,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -3043,7 +3043,7 @@ code = '''
 
 [cases.test_traversal_mutation_rm_bshrub]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 code = '''
@@ -3077,7 +3077,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -3113,7 +3113,7 @@ code = '''
 
 [cases.test_traversal_mutation_mv_src_bshrub]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 code = '''
@@ -3147,7 +3147,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -3183,7 +3183,7 @@ code = '''
 
 [cases.test_traversal_mutation_mv_dst_bshrub]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 code = '''
@@ -3217,7 +3217,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -3253,7 +3253,7 @@ code = '''
 
 [cases.test_traversal_mutation_mroot_split]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 code = '''
@@ -3287,7 +3287,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -3328,7 +3328,7 @@ code = '''
 
 [cases.test_traversal_mutation_mroot_split_bshrub_l]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 code = '''
@@ -3371,7 +3371,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -3423,7 +3423,7 @@ code = '''
 
 [cases.test_traversal_mutation_mroot_split_bshrub_r]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 code = '''
@@ -3466,7 +3466,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -3523,7 +3523,7 @@ code = '''
 
 [cases.test_traversal_mutation_mroot_extend]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 # force early relocations
@@ -3559,7 +3559,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -3598,7 +3598,7 @@ code = '''
 
 [cases.test_traversal_mutation_mroot_extend_bshrub]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 # force early relocations
@@ -3634,7 +3634,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -3679,7 +3679,7 @@ code = '''
 
 [cases.test_traversal_mutation_mroot_relocate]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 # force early relocations
@@ -3724,7 +3724,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -3783,7 +3783,7 @@ code = '''
 
 [cases.test_traversal_mutation_mroot_relocate_bshrub]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 # force early relocations
@@ -3828,7 +3828,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroots
@@ -3878,7 +3878,7 @@ code = '''
 
 [cases.test_traversal_mutation_mtree_split]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 code = '''
@@ -3952,7 +3952,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -4044,7 +4044,7 @@ code = '''
 
 [cases.test_traversal_mutation_mtree_split_bshrub_l]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 code = '''
@@ -4118,7 +4118,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -4204,7 +4204,7 @@ code = '''
 
 [cases.test_traversal_mutation_mtree_split_bshrub_r]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 code = '''
@@ -4278,7 +4278,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -4369,7 +4369,7 @@ code = '''
 
 [cases.test_traversal_mutation_mtree_extend]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 code = '''
@@ -4449,7 +4449,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -4533,7 +4533,7 @@ code = '''
 
 [cases.test_traversal_mutation_mtree_extend_bshrub]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 code = '''
@@ -4613,7 +4613,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -4696,7 +4696,7 @@ code = '''
 
 [cases.test_traversal_mutation_mtree_relocate]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 # force early relocations
@@ -4781,7 +4781,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroot
@@ -4866,7 +4866,7 @@ code = '''
 
 [cases.test_traversal_mutation_mtree_relocate_bshrub]
 defines.CKMETA = [false, true]
-defines.CKDATA = [false, true]
+defines.CK = [false, true]
 defines.LOOKAHEAD = [false, true]
 defines.SIZE = '2*BLOCK_SIZE'
 # force early relocations
@@ -4951,7 +4951,7 @@ code = '''
     lfsr_traversal_t t;
     lfsr_traversal_open(&lfs, &t,
             ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // traverse mroots
@@ -5049,7 +5049,7 @@ code = '''
 defines.STEPS = [1, 2, 4, 8, 16, 32, 64, 128]
 defines.EXCL = [false, true]
 defines.CKMETA = [true]
-defines.CKDATA = [true]
+defines.CK = [true]
 defines.LOOKAHEAD = [false, true]
 defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256]
 code = '''
@@ -5063,7 +5063,7 @@ code = '''
     lfsr_traversal_open(&lfs, &t,
             ((EXCL) ? LFS_T_EXCL : 0)
                 | ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // make this many directories
@@ -5155,7 +5155,7 @@ code = '''
 defines.STEPS = [1, 2, 4, 8, 16, 32, 64, 128]
 defines.EXCL = [false, true]
 defines.CKMETA = [true]
-defines.CKDATA = [true]
+defines.CK = [true]
 defines.LOOKAHEAD = [false, true]
 defines.N = [1, 2, 4, 8, 16, 32, 64, 128, 256]
 defines.OPS = '2*N'
@@ -5176,7 +5176,7 @@ code = '''
     lfsr_traversal_open(&lfs, &t,
             ((EXCL) ? LFS_T_EXCL : 0)
                 | ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     uint32_t prng = SEED;
@@ -5332,7 +5332,7 @@ code = '''
 defines.STEPS = [1, 2, 4, 8, 16, 32, 64, 128]
 defines.EXCL = [false, true]
 defines.CKMETA = [true]
-defines.CKDATA = [true]
+defines.CK = [true]
 defines.LOOKAHEAD = [false, true]
 defines.N = [1, 2, 4, 8, 16, 32, 64]
 defines.SIZE = [
@@ -5356,7 +5356,7 @@ code = '''
     lfsr_traversal_open(&lfs, &t,
             ((EXCL) ? LFS_T_EXCL : 0)
                 | ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     // create this many files
@@ -5432,7 +5432,7 @@ code = '''
 defines.STEPS = [1, 2, 4, 8, 16, 32, 64, 128]
 defines.EXCL = [false, true]
 defines.CKMETA = [true]
-defines.CKDATA = [true]
+defines.CK = [true]
 defines.LOOKAHEAD = [false, true]
 defines.N = [1, 2, 4, 8, 16, 32, 64]
 defines.OPS = '2*N'
@@ -5464,7 +5464,7 @@ code = '''
     lfsr_traversal_open(&lfs, &t,
             ((EXCL) ? LFS_T_EXCL : 0)
                 | ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     uint32_t prng = SEED;
@@ -5671,7 +5671,7 @@ code = '''
 defines.STEPS = [1, 2, 4, 8, 16, 32, 64, 128]
 defines.EXCL = [false, true]
 defines.CKMETA = [true]
-defines.CKDATA = [true]
+defines.CK = [true]
 defines.LOOKAHEAD = [false, true]
 defines.OPS = 20
 defines.SIZE = [
@@ -5735,7 +5735,7 @@ code = '''
     lfsr_traversal_open(&lfs, &t,
             ((EXCL) ? LFS_T_EXCL : 0)
                 | ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     for (lfs_size_t i = 0; i < OPS; i++) {
@@ -5830,7 +5830,7 @@ code = '''
 defines.STEPS = [1, 2, 4, 8, 16, 32, 64, 128]
 defines.EXCL = [false, true]
 defines.CKMETA = [true]
-defines.CKDATA = [true]
+defines.CK = [true]
 defines.LOOKAHEAD = [false, true]
 defines.N = [1, 2, 4, 8, 16, 32, 64]
 defines.OPS = '2*N'
@@ -5872,7 +5872,7 @@ code = '''
     lfsr_traversal_open(&lfs, &t,
             ((EXCL) ? LFS_T_EXCL : 0)
                 | ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     uint32_t prng = SEED;
@@ -6197,7 +6197,7 @@ code = '''
 defines.STEPS = [1, 2, 4, 8, 16, 32, 64, 128]
 defines.EXCL = [false, true]
 defines.CKMETA = [true]
-defines.CKDATA = [true]
+defines.CK = [true]
 defines.LOOKAHEAD = [false, true]
 defines.N = [1, 2, 4, 8, 16, 32, 64]
 defines.OPS = '2*N'
@@ -6240,7 +6240,7 @@ code = '''
     lfsr_traversal_open(&lfs, &t,
             ((EXCL) ? LFS_T_EXCL : 0)
                 | ((CKMETA) ? LFS_T_CKMETA : 0)
-                | ((CKDATA) ? LFS_T_CKDATA : 0)
+                | ((CK) ? LFS_T_CK : 0)
                 | ((LOOKAHEAD) ? LFS_T_LOOKAHEAD : 0)) => 0;
 
     uint32_t prng = SEED;