You didn't mention swapping the SCSI conroller. Have you tried that?
What kind if SCSI controller is it?

Misha wrote:

> I am currently receiving the above error on all backup jobs performed. The
> error occurs when between 300Mb and 400Mb of data has been backed up. Since
> this error first occured, I have had a the Mainboard, Tape Device, SCSI Cable
> and Terminator replaced. 18Gb Read/Write tests performed on the tape devive
> have all been successful. I have tried using Veritas and Microsoft device
> drivers without success. Reinstalling Backupexec from scratch has also proven
> unsuccessful. All device drivers and firmware on the server have been upgraded
> to the latest versions. Relevent details are as follows:
>
> Windows 2000 Server
> Intel 440GX Mainboard
> Seagate STD2401LW-S DDS-4 drive
> Backupexec v8.5 with IDR
>
> If anyone has any suggestions I would be eternally grateful.
>
> Thanks in advance

Its an onboard Adaptec Ultra2 SCSI Adapter (2 channel). I have tried both
channels on both mainboards, all returned the same error. I have also tried
an Adaptec Ultra2 PCI SCSI Card with no luck.

Ken Putnam wrote:
>You didn't mention swapping the SCSI conroller. Have you tried that?
>What kind if SCSI controller is it?