Public bug reported: Binary package hint: dosfstools
mkdosfs will incorrectly calculate the number of sectors of a given FAT partition if the number sectors are odd due to count_blocks incorrectly handling the remainder of a division operation. This miscalculation causes the OMAP4 bootloader to fail to boot. This bug can be observed by comparing the total sector size in fdisk expert more to fsck.msdos; this discrepancy only shows up when the number of sectors are odd: fdisk output: Expert command (m for help): p Disk /dev/sdb: 204 heads, 3 sectors, 12654 cylinders Nr AF Hd Sec Cyl Hd Sec Cyl Start Size ID 1 00 1 1 0 203 3 258 3 158505 83 2 00 0 0 0 0 0 0 0 0 00 3 00 0 0 0 0 0 0 0 0 00 4 00 0 0 0 0 0 0 0 0 00 mcasadevall@daybreak:~/src/dosfstools-3.0.9$ sudo fsck.msdos -v /dev/sdb1 dosfsck 3.0.9 (31 Jan 2010) dosfsck 3.0.9, 31 Jan 2010, FAT32, LFN Checking we can access the last sector of the filesystem Boot sector contents: System ID "mkdosfs" Media byte 0xf8 (hard disk) 512 bytes per logical sector 2048 bytes per cluster 4 reserved sectors First FAT starts at byte 2048 (sector 4) 2 FATs, 16 bit entries 79872 bytes per FAT (= 156 sectors) Root directory starts at byte 161792 (sector 316) 512 root directory entries Data area starts at byte 178176 (sector 348) 39539 data clusters (80975872 bytes) 3 sectors/track, 204 heads 0 hidden sectors 158504 sectors total Checking for unused clusters. /dev/sdb1: 0 files, 0/39539 clusters Compare the difference in sectors total. The attached patch correctly handles the remainder and causes the sector counts to match. ** Affects: dosfstools (Ubuntu) Importance: High Assignee: Michael Casadevall (mcasadevall) Status: Triaged ** Changed in: dosfstools (Ubuntu) Importance: Undecided => High ** Changed in: dosfstools (Ubuntu) Assignee: (unassigned) => Michael Casadevall (mcasadevall) ** Changed in: dosfstools (Ubuntu) Milestone: None => oneiric-alpha-2 ** Changed in: dosfstools (Ubuntu) Status: New => Triaged -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/794043 Title: mkdosfs incorrectly calculates sector total -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs