Here is more information and may be more helpful:

I executed su and then did a gpart /dev/hda. Here are the results:

root@Knoppix:/ramdisk/home/knoppix# gpart /dev/hda

Begin scan...
Possible partition(Windows NT/W2K FS), size(76316mb), offset(0mb)

* Warning: short read near sector(156301299), 64512 bytes instead of 66048. Skip
ping...
End scan.

Checking partitions...
Partition(OS/2 HPFS, NTFS, QNX or Advanced UNIX): primary
Ok.

Guessed primary partition table:
Primary partition(1)
type: 007(0x07)(OS/2 HPFS, NTFS, QNX or Advanced UNIX)
size: 76316mb #s(156296320) s(63-156296382)
chs: (0/1/1)-(1023/15/63)d (0/1/1)-(155055/14/61)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

Does the gpart information look good enough to do a gpart -w?
Thanks