Actually, external SCSI Zip drives show up at eBay, as well as at thrift stores taking donated computers and peripherals. As for the CDs that you burned, are they in the Mac OS Standard (HFS) or Mac OS Extended (HFS+) format? Mac OS 8.0 and all versions preceding it don't support HFS+ volumes. Did you use CD-R disks and not CD-RW disks? The latter aren't compatible with older CD-ROM drives. The 6300 has an 8x CD-ROM drive, and when this problem has been posted in previous years, some have suggested selecting a slower burning speed. In some cases, the color of the CD-R disk's reflective surface has been singled out for causing compatibility problems. Some CD-Rs have an aqua color, while others have a mirror-like appearance. Changing from one type/brand to the other can make a difference. Once these minor issues are cleared up, the 6300 should be capable of reading burned CD-Rs.