-File system specs: --Max 4,294,967,295 Blocks --Max volume size: 4,398,046,510,080 bytes (4 TB) --Max file size: 4,398,046,510,080 bytes (4 TB) --Max filename length: 127 characters -Blocks are 1 KB -Each block has a BN (Block Number) -The volume starts at BN 0 -BN 0 is always the Boot Block -All other blocks can be moved around -Blocks: --Boot Block: First 512 bytes contain boot record, second half contains other misc info --Master Directory Blocks (MDB): Top of B-Tree for a directory --Slave Directory Blocks (SDB): Leaves of the B-Tree for a directory --Master File Blocks (MFB): Top of B+Tree for a file --Slave File Blocks (sFB): Leaves of the B+Tree for a file --Block Usage Bitmap Boot Block: 510 bytes Boot record 2 bytes Bootable signuature (0x55AA) 4 bytes "ZKFS" file system id (ASCII) 8 bytes "1.0 " file system version (ASCII, space padded) 40 bytes Volume label (Unicode-20 characters) 4 bytes Pointer to root directory MDB (BN) 4 bytes Pointer to beginning of swap space (BN) 4 bytes Length of swap space (in blocks) 4 bytes Pointer to beginning of block usage bitmap (BN) 4 bytes Length of block usage bitmap (in blocks) 4 bytes Pointer to beginning of bad block bitmap (BN) 4 bytes Pointer to beginning of directory band (BN) 4 bytes Length of directory band Swap Space blocks: marked as used used as swap space Block usage bitmap: every bit maps one block, 1 if used, 0 if not bad blacks are marked as used all special blocks are marked as used (boot block, MFBs, SFBs, etc.) Bad block bitmap: 8 bytes Signature: 'BBB', 0x00, 'ZKFS' 4 bytes Pointer to next bad block bitmap if this on runs out (if any) 0x00000000 if not used ?? bytes Entries in the form: 4 bytes Pointer to BN of bad block Master File Block: 8 bytes Signature: 'MFB', 0x00, 'ZKFS' 1 byte Full filename length (in bytes) 30 bytes First 15 characters of file name (in unicode) 1 byte Attributes (need to include at all? it's in the Directory Block) Bit 0: compressed Bit 1: encrypted Bit 2: entry is a symbolic link (possible to make inifite loop with symlinks??? bad for searching hard drives) Bit 3: entry is a shortcut (redirects to target; don't mirror it; can be used with URLs) Bit 4: MFB contains the entire file Bit 5: MFB contains pointers directly to Data Blocks Bit 6: MFB contains pointers to SFBs Bit 7: unused 4 bytes Pointer to BN of parent directory MDB 8 bytes file size 2 bytes offset of first free byte in the last data block of the file 2 bytes ACL length (in bytes) 45 bytes First 45 bytes of ACLs 4 bytes Pointer to a block with the rest of the ACLs (if longer than 45 bytes) ?? bytes If bits 2 or 3 are set, this contains the path (in unicode) if bit 4 is set, this contains the entire file If bit 5 is set, this contains entries in the following format 4 bytes block number into the file (starts at 0 at beginning of file) 4 bytes BN of start of extent 4 bytes number of blocks in extent If bit 6 is set, this contains entries in the following format 4 bytes block number into the file (starts at 0 at beginning of file) 4 bytes BN of SFB 4 bytes number of blocks mapped by this SFB Slave File Block: 8 bytes Signature: 'SFB', 0x00, 'ZKFS' 4 bytes Pointer to BN of MFB 4 bytes Pointer to BN of parent SFB (if any) 4 bytes Attributes: Bit 0: contains pointers to Data blocks Bit 1: contains pointers to SFBs Bits 2-30: unused ?? bytes if bit 0 is set then contains entries in the following format 4 bytes block number into the file (starts at 0 at beginning of file) 4 bytes BN of start of extent 4 bytes number of blocks in extent if bit 1 is set then contains entries in the following format 4 bytes block number into the file (starts at 0 at beginning of file) 4 bytes BN of SFB 4 bytes number of blocks mapped by this SFB Directory Block: (2 blocks per DirBlock, 2 KB) 14 8 bytes Signature: 'MDB', 0x00, 'ZKFS' if MDB Signature: 'SDB', 0x00, 'ZKFS' if SDB 4 bytes Pointer to BN of parent directory MDB if MDB Pointer to BN of parent MDB/SDB if SDB 2 bytes Offset to first free entry in MDB 1 byte Full filename length (in bytes) 30 bytes First 15 characters of file name (in unicode) File/Directory entry: 28+filenamesize 2 bytes Entry size (always multiple of 4) 1 byte Flags Bit 0: Encrypted Bit 1: Compressed Bit 2: Directory Bit 3: Has a B-tree down-pointer Bit 4: Has an ACL Bit 5: Entry is a dummy end record Bit 6: Entry is a symbolic link Bit 7: Unused 4 bytes Down-pointer BN 4 bytes Pointer to MFB (BN) 4 bytes Time last modified 4 bytes Time last accessed 4 bytes Time created 8 bytes File size 1 byte Name Length (in bytes) ? bytes Name (unicode) (max 127 characters, 254 bytes) End entry: 2 bytes Entry size (4 if no down-pointer, 8 if down pointer) 1 byte Flags: Bit 0-2: unused Bit 3: Has a B-tree down-pointer Bit 4: unused Bit 5: Always 1 Bit 6-7: unused 1 byte padding 4 bytes Down-pointer BN .. directory entry always points to parent directory MDB!