The Sony 541 is single session Photo CD compliant. I have one and have
successfully read a Photo CD with it. I used it with the Media Vison Pro Audio
Spectrum sound card, but it should also work OK with the Corel SCSI drivers and
any ASPI compliant SCSI controller card.
It is not multi-session compliant nor is an upgrade available, but Sony does
offer a multi-session compliant drive D/L KODAK.TXT for details.