ext3 partition: Filesystem type unknown

[Samuel Hartmann]

I have devided a 500 GB Harddisk into three partitions. All partitions 
are formatted in ext3. Grub can only access the first partition and 
reports "Filesystem type unknown" when I try to access the other partitions.

When I list the partitions by pressing the tab key I get the following:

grub> root (hd0, <TAB>
 Possible partitions are:
   Partition num: 0,  Filesystem type is ext2fs, partition type 0x83
   Partition num: 1,  Filesystem type unknown, partition type 0x83
   Partition num: 2,  Filesystem type unknown, partition type 0x83


When I run grub in emulation mode from the linux system started from the 
first partition (hd0,0) the file systems are recognised:

grub> root (hd0, <TAB>
 Possible partitions are:
   Partition num: 0,  Filesystem type is ext2fs, partition type 0x83
   Partition num: 1,  Filesystem type is ext2fs, partition type 0x83
   Partition num: 2,  Filesystem type is ext2fs, partition type 0x83



I have no idea how to solve the problem. I would be glad if somebody 
could help me.

regards,

Samuel



Some more information:

grub> geometry (hd0) (in emulation mode)
drive 0x80: C/H/S = 60801/255/63, The number of sectors = 976773168, 
/dev/hda
   Partition num: 0,  Filesystem type is ext2fs, partition type 0x83
   Partition num: 1,  Filesystem type is ext2fs, partition type 0x83
   Partition num: 2,  Filesystem type is ext2fs, partition type 0x83


address@hidden:~# fdisk -l /dev/hda

Disk /dev/hda: 500.1 GB, 500107862016 bytes
255 heads, 63 sectors/track, 60801 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes

   Device Boot      Start         End      Blocks   Id  System
/dev/hda1   *           1       20397   163838871   83  Linux
/dev/hda2           20398       40794   163838902+  83  Linux
/dev/hda3           40795       60801   160706227+  83  Linux

address@hidden:~# grub --version
grub (GNU GRUB 0.97)


OS: Ubuntu 6.06