This article is from the CD-Recordable FAQ, by Andy McFadden (email@example.com) with numerous contributions by others.
Good SCSI cables and correct termination are absolutely essential. SCSI
bus errors can cause buffer underruns or corrupted data (especially since
some vendors ship drives with parity checking disabled).
Bertel Schmitt wrote an excellent article on the ins and outs of proper
cabling and termination. The article can be found in text form at
http://www.fadden.com/doc/scsi-trm.txt. Granite Digital, a company
that makes high-quality cables and terminators, can be found at
If you're using an HP 4020i with the AdvanSys SCSI card, reducing the DMA
transfer rate may help.