[CentOS] Curious fdisk report on large disk
James Pearson
james-p at moving-picture.com
Tue Apr 26 16:25:42 UTC 2011
Timothy Murphy wrote:
> I have a 1.5TB internal disk on my server.
> I partitioned this with fdisk,
> and CentOS-5.6 runs perfectly on it.
> But fdisk gives a very strange report.
>
> Here is the perfectly normal response to mount:
> -----------------------------
> /dev/sdb10 on / type ext3 (rw)
> proc on /proc type proc (rw)
> sysfs on /sys type sysfs (rw)
> devpts on /dev/pts type devpts (rw,gid=5,mode=620)
> /dev/sdb2 on /boot type ext3 (rw)
> tmpfs on /dev/shm type tmpfs (rw)
> /dev/sdb5 on /home type ext3 (rw)
> /dev/sdb6 on /common type ext3 (rw)
> /dev/sdb7 on /BackupPC type ext3 (rw)
> /dev/sdb8 on /Photos type ext3 (rw)
> none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
> sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
> nfsd on /proc/fs/nfsd type nfsd (rw)
> -----------------------------
> and here is the response to "sudo fdisk /dev/sdb"
> -----------------------------
> Disk /dev/sdb: 1500.3 GB, 1500301910016 bytes
> 255 heads, 63 sectors/track, 182401 cylinders
> Units = cylinders of 16065 * 512 = 8225280 bytes
>
> This doesn't look like a partition table
> Probably you selected the wrong device.
>
> Device Boot Start End Blocks Id System
> /dev/sdb1 ? 188019 188051 253319 e4 SpeedStor
> Partition 1 does not end on cylinder boundary.
> /dev/sdb2 ? 62656 186401 993984023 98 Unknown
> Partition 2 does not end on cylinder boundary.
> /dev/sdb3 ? 105611 225119 959953209 7d Unknown
> Partition 3 does not end on cylinder boundary.
> /dev/sdb4 ? 347 865 4161536 0 Empty
> Partition 4 does not end on cylinder boundary.
>
> Partition table entries are not in disk order
> -----------------------------
Could it be that the partition table has become corrupt (e.g. overwritten)?
If this has been the case, then you need to find a tool that can attempt
to recover the partition table - see
<http://tldp.org/HOWTO/Partition/recovering.html>
James Pearson
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