Map LBA to File
From Attie's Wiki
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http://smartmontools.sourceforge.net/badblockhowto.html | http://smartmontools.sourceforge.net/badblockhowto.html | ||
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Bad LBA = 0x0a8ae67d = 176875133 | Bad LBA = 0x0a8ae67d = 176875133 | ||
| − | + | <source lang="text"> | |
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$ sudo fdisk -lu /dev/sda | $ sudo fdisk -lu /dev/sda | ||
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/dev/sda3 168181823 172376126 2097152 82 Linux swap / Solaris | /dev/sda3 168181823 172376126 2097152 82 Linux swap / Solaris | ||
/dev/sda4 172376127 976768064 402195969 83 Linux | /dev/sda4 172376127 976768064 402195969 83 Linux | ||
| + | </source> | ||
| + | therefore it's on <code>/dev/sda4</code>, which is mounted on <code>/home</code> (ext4) | ||
| − | + | <source lang="text"> | |
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$ sudo tune2fs -l /dev/sda4 | grep Block | $ sudo tune2fs -l /dev/sda4 | grep Block | ||
Block count: 100548992 | Block count: 100548992 | ||
Block size: 4096 | Block size: 4096 | ||
Blocks per group: 32768 | Blocks per group: 32768 | ||
| + | </source> | ||
| + | <source lang="text"> | ||
| + | b = (int)(((L-S)*512)/B) | ||
| + | </source> | ||
| + | where:<br> | ||
| + | {| | ||
| + | | b || = || File System block number | ||
| + | |- | ||
| + | | B || = || File system block size in bytes | ||
| + | |- | ||
| + | | L || = || LBA of bad sector | ||
| + | |- | ||
| + | | S || = || Starting sector of partition as shown by fdisk -lu | ||
| + | |- | ||
| + | |colspan="2"|(int) || denotes the integer part (round it DOWN to a whole number). | ||
| + | |} | ||
| + | <source lang="text"> | ||
| + | b = (int)((176875133-172376127) * 512 / 4096) | ||
| + | b = (int)562375.75 | ||
| + | b = 562375 | ||
| + | </source> | ||
| − | + | <source lang="text"> | |
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$ sudo debugfs | $ sudo debugfs | ||
debugfs 1.41.9 (22-Aug-2009) | debugfs 1.41.9 (22-Aug-2009) | ||
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Block 562375 not in use | Block 562375 not in use | ||
debugfs: quit | debugfs: quit | ||
| + | </source> | ||
| + | '''** OR **''' | ||
| − | + | <source lang="text"> | |
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$ sudo debugfs | $ sudo debugfs | ||
debugfs 1.41.9 (22-Aug-2009) | debugfs 1.41.9 (22-Aug-2009) | ||
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^C | ^C | ||
debugfs: quit | debugfs: quit | ||
| − | </ | + | </source> |
Revision as of 16:42, 24 May 2012
http://smartmontools.sourceforge.net/badblockhowto.html
Bad LBA = 0x0a8ae67d = 176875133
$ sudo fdisk -lu /dev/sda Disk /dev/sda: 500.1 GB, 500107862016 bytes 255 heads, 63 sectors/track, 60801 cylinders, total 976773168 sectors Units = sectors of 1 * 512 = 512 bytes Disk identifier: 0x030818eb Device Boot Start End Blocks Id System /dev/sda1 * 63 409662 204800 83 Linux Partition 1 does not end on cylinder boundary. /dev/sda2 409663 168181822 83886080 83 Linux /dev/sda3 168181823 172376126 2097152 82 Linux swap / Solaris /dev/sda4 172376127 976768064 402195969 83 Linux
therefore it's on /dev/sda4, which is mounted on /home (ext4)
$ sudo tune2fs -l /dev/sda4 | grep Block Block count: 100548992 Block size: 4096 Blocks per group: 32768
b = (int)(((L-S)*512)/B)
where:
| b | = | File System block number |
| B | = | File system block size in bytes |
| L | = | LBA of bad sector |
| S | = | Starting sector of partition as shown by fdisk -lu |
| (int) | denotes the integer part (round it DOWN to a whole number). | |
b = (int)((176875133-172376127) * 512 / 4096) b = (int)562375.75 b = 562375
$ sudo debugfs debugfs 1.41.9 (22-Aug-2009) debugfs: open /dev/sda4 debugfs: testb 562375 Block 562375 not in use debugfs: quit
** OR **
$ sudo debugfs debugfs 1.41.9 (22-Aug-2009) debugfs: open /dev/sda4 debugfs: testb 562375 Block 562375 marked in use debugfs: icheck 562375 Block Inode number 562375 132344 debugfs: ncheck 132344 Inode Pathname 132344 /attie/banner.jpg ^C debugfs: quit
