Difference between bbox mke2fs and standard one (dumpe2fs comparison): [upd: inode size has been fixed since then] Two significant differences: - standard mke2fs has resize_inode feature and thus has reserved GDT blocks, which decreases free blocks; - inode size: 128/256 (since 679807k is >0.5G, standard mke2fs uses "big" inodes) this affects inode table in block groups Filesystem volume name: Filesystem volume name: Last mounted on: Last mounted on: Filesystem UUID: f4839760-c89b-44b7-ac52-08b4e326c0b4 Filesystem UUID: 71179558-8c8e-4a56-ad54-018008f5c358 Filesystem magic number: 0xEF53 Filesystem magic number: 0xEF53 Filesystem revision #: 1 (dynamic) Filesystem revision #: 1 (dynamic) Filesystem features: ext_attr dir_index filetype sparse_super Filesystem features: ext_attr resize_inode dir_index filetype sparse_super large_file Filesystem flags: signed_directory_hash Filesystem flags: signed_directory_hash Default mount options: (none) Default mount options: (none) Filesystem state: clean Filesystem state: clean Errors behavior: Continue Errors behavior: Continue Filesystem OS type: Linux Filesystem OS type: Linux Inode count: 42624 Inode count: 42528 Block count: 169951 Block count: 169951 Reserved block count: 8497 Reserved block count: 8497 Free blocks: 168594 Free blocks: 167103 Free inodes: 42613 Free inodes: 42517 First block: 0 First block: 0 Block size: 4096 Block size: 4096 Fragment size: 4096 Fragment size: 4096 Reserved GDT blocks: 41 Blocks per group: 32768 Blocks per group: 32768 Fragments per group: 32768 Fragments per group: 32768 Inodes per group: 7104 Inodes per group: 7088 Inode blocks per group: 222 Inode blocks per group: 443 Filesystem created: Wed Oct 21 13:40:55 2009 Filesystem created: Wed Oct 21 13:40:55 2009 Last mount time: n/a Last mount time: n/a Last write time: Wed Oct 21 13:40:55 2009 Last write time: Wed Oct 21 13:40:55 2009 Mount count: 0 Mount count: 0 Maximum mount count: 20 Maximum mount count: 37 Last checked: Wed Oct 21 13:40:55 2009 Last checked: Wed Oct 21 13:40:55 2009 Check interval: 15552000 (6 months) Check interval: 15552000 (6 months) Next check after: Mon Apr 19 13:40:55 2010 Next check after: Mon Apr 19 13:40:55 2010 Reserved blocks uid: 0 (user root) Reserved blocks uid: 0 (user root) Reserved blocks gid: 0 (group root) Reserved blocks gid: 0 (group root) First inode: 11 First inode: 11 Inode size: 128 Inode size: 256 Required extra isize: 28 Desired extra isize: 28 Default directory hash: half_md4 Default directory hash: half_md4 Directory Hash Seed: ff94d047-c9ca-4fe5-b553-937a76101a89 Directory Hash Seed: c270fd43-9868-4a92-ae99-050098e12835 Group 0: (Blocks 0-32767) Group 0: (Blocks 0-32767) Primary superblock at 0, Group descriptors at 1-1 Primary superblock at 0, Group descriptors at 1-1 Reserved GDT blocks at 2-42 Block bitmap at 2 (+2), Inode bitmap at 3 (+3) Block bitmap at 43 (+43), Inode bitmap at 44 (+44) Inode table at 4-225 (+4) Inode table at 45-487 (+45) 32537 free blocks, 7093 free inodes, 2 directories 32274 free blocks, 7077 free inodes, 2 directories Free blocks: 231-32767 Free blocks: 494-32767 Free inodes: 12-7104 Free inodes: 12-7088 Group 1: (Blocks 32768-65535) Group 1: (Blocks 32768-65535) Backup superblock at 32768, Group descriptors at 32769-32769 Backup superblock at 32768, Group descriptors at 32769-32769 Reserved GDT blocks at 32770-32810 Block bitmap at 32770 (+2), Inode bitmap at 32771 (+3) Block bitmap at 32811 (+43), Inode bitmap at 32812 (+44) Inode table at 32772-32993 (+4) Inode table at 32813-33255 (+45) 32542 free blocks, 7104 free inodes, 0 directories 32280 free blocks, 7088 free inodes, 0 directories Free blocks: 32994-65535 Free blocks: 33256-65535 Free inodes: 7105-14208 Free inodes: 7089-14176 Group 2: (Blocks 65536-98303) Group 2: (Blocks 65536-98303) Block bitmap at 65536 (+0), Inode bitmap at 65537 (+1) Block bitmap at 65536 (+0), Inode bitmap at 65537 (+1) Inode table at 65538-65759 (+2) Inode table at 65538-65980 (+2) 32544 free blocks, 7104 free inodes, 0 directories 32323 free blocks, 7088 free inodes, 0 directories Free blocks: 65760-98303 Free blocks: 65981-98303 Free inodes: 14209-21312 Free inodes: 14177-21264 ...