Partition Rescue

fdisk -l -u

Disk /dev/sda: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders, total 1953525168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x000a826d

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1              63     2120579     1060258+  83  Linux

cat /proc/partitions

major minor  #blocks  name
   8        0  976762584 sda
   8        1   23635968 sda1
   8        2          1 sda2
   8        5  953123840 sda5

hdparm -g /dev/sda1

/dev/sda1:
 geometry      = 56065/255/63, sectors = 47271936, start = 1906251776

hdparm -g /dev/sda2

/dev/sda2:
 geometry      = 56065/255/63, sectors = 2, start = 2046

hdparm -g /dev/sda3

/dev/sda3: No such file or directory

hdparm -g /dev/sda4

/dev/sda4: No such file or directory

hdparm -g /dev/sda5

/dev/sda5:
 geometry      = 118658/255/63, sectors = 1906247680, start = 2048

gpart /dev/sda

Begin scan...

Possible partition(Linux ext2), size(84mb), offset(426321mb)
End scan.

Checking partitions...
Partition(Linux ext2 filesystem): primary 
Ok.

Guessed primary partition table:
Primary partition(1)
   type: 131(0x83)(Linux ext2 filesystem)
   size: 84mb #s(172032) s(873105408-873277439)
   chs:  (1023/254/63)-(1023/254/63)d (54348/76/1)-(54359/1/42)r

Primary partition(2)
   type: 000(0x00)(unused)
   size: 0mb #s(0) s(0-0)
   chs:  (0/0/0)-(0/0/0)d (0/0/0)-(0/0/0)r

Primary partition(3)
   type: 000(0x00)(unused)
   size: 0mb #s(0) s(0-0)
   chs:  (0/0/0)-(0/0/0)d (0/0/0)-(0/0/0)r

Primary partition(4)
   type: 000(0x00)(unused)
   size: 0mb #s(0) s(0-0)
   chs:  (0/0/0)-(0/0/0)d (0/0/0)-(0/0/0)r

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Partition-Rescue HOWTO
http://www.faqs.org/docs/Linux-mini/Partition-Rescue.html