nicola@nicola-desktop:~$ sudo gpart /dev/sda

Begin scan...
Possible partition(DOS FAT), size(109mb), offset(218mb)
Possible partition(DOS FAT), size(125mb), offset(20159mb)
Possible partition(ReiserFS filesystem), size(18512mb), offset(20285mb)
Possible extended partition at offset(38797mb)
Possible partition(Linux swap), size(407mb), offset(38797mb)
End scan.

Checking partitions...
Partition(Primary 'big' DOS (> 32MB)): primary
Partition(DOS or Windows 95 with 32 bit FAT, LBA): primary
Partition(Linux ext2 filesystem): primary
Partition(Linux swap or Solaris/x86): primary
Ok.

Guessed primary partition table:
Primary partition(1)
type: 006(0x06)(Primary 'big' DOS (> 32MB))
size: 109mb #s(223684) s(447867-671550)
chs: (27/224/1)-(41/204/34)d (27/224/1)-(41/204/34)r

Primary partition(2)
type: 012(0x0C)(DOS or Windows 95 with 32 bit FAT, LBA)
size: 125mb #s(257040) s(41287050-41544089)
chs: (1023/254/63)-(1023/254/63)d (2570/0/1)-(2585/254/63)r

Primary partition(3)
type: 131(0x83)(Linux ext2 filesystem)
size: 18512mb #s(37913344) s(41544090-79457433)
chs: (1023/254/63)-(1023/254/63)d (2586/0/1)-(4945/254/7)r

Primary partition(4)
type: 130(0x82)(Linux swap or Solaris/x86)
size: 407mb #s(835312) s(79457553-80292864)
chs: (1023/254/63)-(1023/254/63)d (4946/1/1)-(4997/254/58)r


cmq più che la tabella delle partizioni mi sembra che si sia corrotto proprio il FS visto che grub ha scritto dove non doveva :S (e linux mi parte e funziona alla perfezione)