diff --git a/SPEC.md b/SPEC.md
index d8c8549..31ed097 100644
--- a/SPEC.md
+++ b/SPEC.md
@@ -233,19 +233,19 @@ Metadata tag fields:
    into a 3-bit abstract type and an 8-bit chunk field. Note that the value
    `0x000` is invalid and not assigned a type.
 
-3. **Type1 (3-bits)** - Abstract type of the tag. Groups the tags into
-   8 categories that facilitate bitmasked lookups.
+    1. **Type1 (3-bits)** - Abstract type of the tag. Groups the tags into
+       8 categories that facilitate bitmasked lookups.
 
-4. **Chunk (8-bits)** - Chunk field used for various purposes by the different
-   abstract types.  type1+chunk+id form a unique identifier for each tag in the
-   metadata block.
+    2. **Chunk (8-bits)** - Chunk field used for various purposes by the different
+       abstract types.  type1+chunk+id form a unique identifier for each tag in the
+       metadata block.
 
-5. **Id (10-bits)** - File id associated with the tag. Each file in a metadata
+3. **Id (10-bits)** - File id associated with the tag. Each file in a metadata
    block gets a unique id which is used to associate tags with that file. The
    special value `0x3ff` is used for any tags that are not associated with a
    file, such as directory and global metadata.
 
-6. **Length (10-bits)** - Length of the data in bytes. The special value
+4. **Length (10-bits)** - Length of the data in bytes. The special value
    `0x3ff` indicates that this tag has been deleted.
 
 ## Metadata types
diff --git a/bd/lfs2_filebd.c b/bd/lfs2_filebd.c
index 753f5d4..561519c 100644
--- a/bd/lfs2_filebd.c
+++ b/bd/lfs2_filebd.c
@@ -80,7 +80,7 @@ int lfs2_filebd_read(const struct lfs2_config *cfg, lfs2_block_t block,
     LFS2_ASSERT(size % cfg->read_size == 0);
     LFS2_ASSERT(block < cfg->block_count);
 
-    // zero for reproducability (in case file is truncated)
+    // zero for reproducibility (in case file is truncated)
     if (bd->cfg->erase_value != -1) {
         memset(buffer, bd->cfg->erase_value, size);
     }
diff --git a/bd/lfs2_rambd.c b/bd/lfs2_rambd.c
index 2e693f2..9f6fa3d 100644
--- a/bd/lfs2_rambd.c
+++ b/bd/lfs2_rambd.c
@@ -32,10 +32,12 @@ int lfs2_rambd_createcfg(const struct lfs2_config *cfg,
         }
     }
 
-    // zero for reproducability?
+    // zero for reproducibility?
     if (bd->cfg->erase_value != -1) {
         memset(bd->buffer, bd->cfg->erase_value,
                 cfg->block_size * cfg->block_count);
+    } else {
+        memset(bd->buffer, 0, cfg->block_size * cfg->block_count);
     }
 
     LFS2_RAMBD_TRACE("lfs2_rambd_createcfg -> %d", 0);
diff --git a/lfs2.c b/lfs2.c
index 4e1f854..93cbbed 100644
--- a/lfs2.c
+++ b/lfs2.c
@@ -11,6 +11,7 @@
 #define LFS2_BLOCK_INLINE ((lfs2_block_t)-2)
 
 /// Caching block device operations ///
+
 static inline void lfs2_cache_drop(lfs2_t *lfs2, lfs2_cache_t *rcache) {
     // do not zero, cheaper if cache is readonly or only going to be
     // written with identical data (during relocates)
@@ -268,22 +269,26 @@ static inline int lfs2_pair_cmp(
              paira[0] == pairb[1] || paira[1] == pairb[0]);
 }
 
+#ifndef LFS2_READONLY
 static inline bool lfs2_pair_sync(
         const lfs2_block_t paira[2],
         const lfs2_block_t pairb[2]) {
     return (paira[0] == pairb[0] && paira[1] == pairb[1]) ||
            (paira[0] == pairb[1] && paira[1] == pairb[0]);
 }
+#endif
 
 static inline void lfs2_pair_fromle32(lfs2_block_t pair[2]) {
     pair[0] = lfs2_fromle32(pair[0]);
     pair[1] = lfs2_fromle32(pair[1]);
 }
 
+#ifndef LFS2_READONLY
 static inline void lfs2_pair_tole32(lfs2_block_t pair[2]) {
     pair[0] = lfs2_tole32(pair[0]);
     pair[1] = lfs2_tole32(pair[1]);
 }
+#endif
 
 // operations on 32-bit entry tags
 typedef uint32_t lfs2_tag_t;
@@ -365,6 +370,7 @@ static inline bool lfs2_gstate_iszero(const lfs2_gstate_t *a) {
     return true;
 }
 
+#ifndef LFS2_READONLY
 static inline bool lfs2_gstate_hasorphans(const lfs2_gstate_t *a) {
     return lfs2_tag_size(a->tag);
 }
@@ -376,6 +382,7 @@ static inline uint8_t lfs2_gstate_getorphans(const lfs2_gstate_t *a) {
 static inline bool lfs2_gstate_hasmove(const lfs2_gstate_t *a) {
     return lfs2_tag_type1(a->tag);
 }
+#endif
 
 static inline bool lfs2_gstate_hasmovehere(const lfs2_gstate_t *a,
         const lfs2_block_t *pair) {
@@ -388,11 +395,13 @@ static inline void lfs2_gstate_fromle32(lfs2_gstate_t *a) {
     a->pair[1] = lfs2_fromle32(a->pair[1]);
 }
 
+#ifndef LFS2_READONLY
 static inline void lfs2_gstate_tole32(lfs2_gstate_t *a) {
     a->tag     = lfs2_tole32(a->tag);
     a->pair[0] = lfs2_tole32(a->pair[0]);
     a->pair[1] = lfs2_tole32(a->pair[1]);
 }
+#endif
 
 // other endianness operations
 static void lfs2_ctz_fromle32(struct lfs2_ctz *ctz) {
@@ -416,6 +425,7 @@ static inline void lfs2_superblock_fromle32(lfs2_superblock_t *superblock) {
     superblock->attr_max    = lfs2_fromle32(superblock->attr_max);
 }
 
+#ifndef LFS2_READONLY
 static inline void lfs2_superblock_tole32(lfs2_superblock_t *superblock) {
     superblock->version     = lfs2_tole32(superblock->version);
     superblock->block_size  = lfs2_tole32(superblock->block_size);
@@ -424,6 +434,7 @@ static inline void lfs2_superblock_tole32(lfs2_superblock_t *superblock) {
     superblock->file_max    = lfs2_tole32(superblock->file_max);
     superblock->attr_max    = lfs2_tole32(superblock->attr_max);
 }
+#endif
 
 #ifndef LFS2_NO_ASSERT
 static bool lfs2_mlist_isopen(struct lfs2_mlist *head,
@@ -1449,7 +1460,7 @@ static int lfs2_dir_alloc(lfs2_t *lfs2, lfs2_mdir_t *dir) {
         }
     }
 
-    // zero for reproducability in case initial block is unreadable
+    // zero for reproducibility in case initial block is unreadable
     dir->rev = 0;
 
     // rather than clobbering one of the blocks we just pretend
@@ -1509,7 +1520,6 @@ static int lfs2_dir_split(lfs2_t *lfs2,
         lfs2_mdir_t *dir, const struct lfs2_mattr *attrs, int attrcount,
         lfs2_mdir_t *source, uint16_t split, uint16_t end) {
     // create tail directory
-    lfs2_alloc_ack(lfs2);
     lfs2_mdir_t tail;
     int err = lfs2_dir_alloc(lfs2, &tail);
     if (err) {
@@ -2730,7 +2740,6 @@ static int lfs2_file_outline(lfs2_t *lfs2, lfs2_file_t *file) {
 }
 #endif
 
-#ifndef LFS2_READONLY
 static int lfs2_file_flush(lfs2_t *lfs2, lfs2_file_t *file) {
     if (file->flags & LFS2_F_READING) {
         if (!(file->flags & LFS2_F_INLINE)) {
@@ -2739,6 +2748,7 @@ static int lfs2_file_flush(lfs2_t *lfs2, lfs2_file_t *file) {
         file->flags &= ~LFS2_F_READING;
     }
 
+#ifndef LFS2_READONLY
     if (file->flags & LFS2_F_WRITING) {
         lfs2_off_t pos = file->pos;
 
@@ -2805,10 +2815,10 @@ relocate:
 
         file->pos = pos;
     }
+#endif
 
     return 0;
 }
-#endif
 
 #ifndef LFS2_READONLY
 static int lfs2_file_rawsync(lfs2_t *lfs2, lfs2_file_t *file) {
@@ -3081,13 +3091,11 @@ static lfs2_soff_t lfs2_file_rawseek(lfs2_t *lfs2, lfs2_file_t *file,
         return npos;
     }
 
-#ifndef LFS2_READONLY
     // write out everything beforehand, may be noop if rdonly
     int err = lfs2_file_flush(lfs2, file);
     if (err) {
         return err;
     }
-#endif
 
     // update pos
     file->pos = npos;
@@ -4074,7 +4082,7 @@ static int lfs2_fs_relocate(lfs2_t *lfs2,
             lfs2_fs_prepmove(lfs2, 0x3ff, NULL);
         }
 
-        // replace bad pair, either we clean up desync, or no desync occured
+        // replace bad pair, either we clean up desync, or no desync occurred
         lfs2_pair_tole32(newpair);
         err = lfs2_dir_commit(lfs2, &parent, LFS2_MKATTRS(
                 {LFS2_MKTAG_IF(moveid != 0x3ff,
diff --git a/lfs2.h b/lfs2.h
index 815b97b..050792a 100644
--- a/lfs2.h
+++ b/lfs2.h
@@ -159,49 +159,49 @@ struct lfs2_config {
     // information to the block device operations
     void *context;
 
-    // Read a region in a block. Negative error codes are propogated
+    // Read a region in a block. Negative error codes are propagated
     // to the user.
     int (*read)(const struct lfs2_config *c, lfs2_block_t block,
             lfs2_off_t off, void *buffer, lfs2_size_t size);
 
     // Program a region in a block. The block must have previously
-    // been erased. Negative error codes are propogated to the user.
+    // been erased. Negative error codes are propagated to the user.
     // May return LFS2_ERR_CORRUPT if the block should be considered bad.
     int (*prog)(const struct lfs2_config *c, lfs2_block_t block,
             lfs2_off_t off, const void *buffer, lfs2_size_t size);
 
     // Erase a block. A block must be erased before being programmed.
     // The state of an erased block is undefined. Negative error codes
-    // are propogated to the user.
+    // are propagated to the user.
     // May return LFS2_ERR_CORRUPT if the block should be considered bad.
     int (*erase)(const struct lfs2_config *c, lfs2_block_t block);
 
     // Sync the state of the underlying block device. Negative error codes
-    // are propogated to the user.
+    // are propagated to the user.
     int (*sync)(const struct lfs2_config *c);
 
 #ifdef LFS2_THREADSAFE
     // Lock the underlying block device. Negative error codes
-    // are propogated to the user.
+    // are propagated to the user.
     int (*lock)(const struct lfs2_config *c);
 
     // Unlock the underlying block device. Negative error codes
-    // are propogated to the user.
+    // are propagated to the user.
     int (*unlock)(const struct lfs2_config *c);
 #endif
 
-    // Minimum size of a block read. All read operations will be a
+    // Minimum size of a block read in bytes. All read operations will be a
     // multiple of this value.
     lfs2_size_t read_size;
 
-    // Minimum size of a block program. All program operations will be a
-    // multiple of this value.
+    // Minimum size of a block program in bytes. All program operations will be
+    // a multiple of this value.
     lfs2_size_t prog_size;
 
-    // Size of an erasable block. This does not impact ram consumption and
-    // may be larger than the physical erase size. However, non-inlined files
-    // take up at minimum one block. Must be a multiple of the read
-    // and program sizes.
+    // Size of an erasable block in bytes. This does not impact ram consumption
+    // and may be larger than the physical erase size. However, non-inlined
+    // files take up at minimum one block. Must be a multiple of the read and
+    // program sizes.
     lfs2_size_t block_size;
 
     // Number of erasable blocks on the device.
@@ -215,11 +215,11 @@ struct lfs2_config {
     // Set to -1 to disable block-level wear-leveling.
     int32_t block_cycles;
 
-    // Size of block caches. Each cache buffers a portion of a block in RAM.
-    // The littlefs needs a read cache, a program cache, and one additional
+    // Size of block caches in bytes. Each cache buffers a portion of a block in
+    // RAM. The littlefs needs a read cache, a program cache, and one additional
     // cache per file. Larger caches can improve performance by storing more
-    // data and reducing the number of disk accesses. Must be a multiple of
-    // the read and program sizes, and a factor of the block size.
+    // data and reducing the number of disk accesses. Must be a multiple of the
+    // read and program sizes, and a factor of the block size.
     lfs2_size_t cache_size;
 
     // Size of the lookahead buffer in bytes. A larger lookahead buffer
@@ -485,7 +485,7 @@ int lfs2_stat(lfs2_t *lfs2, const char *path, struct lfs2_info *info);
 // Returns the size of the attribute, or a negative error code on failure.
 // Note, the returned size is the size of the attribute on disk, irrespective
 // of the size of the buffer. This can be used to dynamically allocate a buffer
-// or check for existance.
+// or check for existence.
 lfs2_ssize_t lfs2_getattr(lfs2_t *lfs2, const char *path,
         uint8_t type, void *buffer, lfs2_size_t size);
 
diff --git a/scripts/test.py b/scripts/test.py
index e1935a0..73a5fec 100755
--- a/scripts/test.py
+++ b/scripts/test.py
@@ -565,7 +565,7 @@ class TestSuite:
                     path=self.path))
                 mk.write('\n')
 
-            # add truely global defines globally
+            # add truly global defines globally
             for k, v in sorted(self.defines.items()):
                 mk.write('%s.test: override CFLAGS += -D%s=%r\n'
                     % (self.path, k, v))
@@ -656,7 +656,7 @@ def main(**args):
         for path in glob.glob(testpath):
             suites.append(TestSuite(path, classes, defines, filter, **args))
 
-    # sort for reproducability
+    # sort for reproducibility
     suites = sorted(suites)
 
     # generate permutations