I have two PCs. One is older than the other in terms of hardware. I have a SCSI controller and a CDROM-RW and a TRAVAN tape backup device(both SCSI). In the old machine everything(SCSI) works perfectly. In the newer machine writing to the CDROM-RW or TRAVAN device will fail(sometimes at the beginning/middle and end, there is no pattern). There are NO error messages. Please help.