says Thomas Cameron:
Please post the results of:
cat /proc/partitions
cat /etc/fstab 
fdisk -l /dev/sda

I reply:
bmike1@bmike1:~$ su
Password:
root@bmike1:/home/bmike1# cat /proc/partitions; cat /etc/fstab; fdisk -l 
/dev/sda
major minor  #blocks  name

   8     0    1025500 sda
   8     1     409584 sda1
   8     2          1 sda2
   8     5     511984 sda5
   8     6     103408 sda6
   3     0   29316672 hda
   3     1   14659281 hda1
   3     2          1 hda2
   3     5   14651248 hda5
# /etc/fstab: filesystem table.
#
# filesystem  mountpoint  type  options  dump  pass
/dev/cdrom  /cdrom  iso9660  defaults,ro,user,noexec,noauto  0  0
/dev/fd0  /floppy  vfat  defaults,user,auto,showexec,umask=022  0  0
/dev/hda1 /mnt/hda1 vfat defaults,users,exec,umask=000,uid=knoppix,gid=knoppix 
0 0
/dev/hda5  /  ext3  defaults,errors=remount-ro  0  1
/dev/sda5 /mnt/sda5 ext3 defaults,users,exec 0 2
/dev/sda6 /mnt/sda6 ext3 defaults,users,exec 0 2
/dev/sda1 swap swap noauto 0 0
proc  /proc  proc  defaults  0  0

Disk /dev/sda: 1050 MB, 1050112000 bytes
64 heads, 32 sectors/track, 1001 cylinders
Units = cylinders of 2048 * 512 = 1048576 bytes

   Device Boot    Start       End    Blocks   Id  System
/dev/sda1   *         1       400    409584   82  Linux swap
/dev/sda2           401      1001    615424    5  Extended
/dev/sda5           401       900    511984   83  Linux
/dev/sda6           901      1001    103408   83  Linux
root@bmike1:/home/bmike1#