install doesn't see scsi disk

[Joe Mc Cool <joe@benburb.demon.co.uk>]

Please,

I suspect this is something simple.  I am booting from an IDE Cdrom 
(sarge), but the install does not detect my scsi hard disk.

I've tried 3 separate disks without success and I have ruled out the 
problem of termination on the cable.

Thanks

Joe.