hardisk on /dev/sda is not detected after boot

Hi,

My disk is not being detected after boot.
I'm detailing more information below...

Thanks in advance!

I'm trying to install knoppix is an Intel S5000PAL server.
/proc/partition is only seeing cloop0.

00:1f.1 IDE interface: Intel Corporation Enterprise Southbridge PATA (rev 09)
00:1f.2 SATA controller: Intel Corporation Enterprise Southbridge SATA AHCI (rev 09)

SLES10 is seeing sda with the following dmesgs:
SCSI device sda: 195371568 512-byte hdwr sectors (100030 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
SCSI device sda: 195371568 512-byte hdwr sectors (100030 MB)
sda: Write Protect is off
sda: Mode Sense: 00 3a 00 00
SCSI device sda: drive cache: write back
sda: sda1 sda2
sd 0:0:0:0: Attached scsi disk sda