Well, 64k is fine for 8MB of RAM, but for 16MB it would be preferrable to have more. I doubt you'd notice much of a difference though. 64kb is still much better than 0kb. My dx-33 only had 64kb cache, and it was fine.
The 2X CD-ROM drives do indeed seek quite a lot. The Sony drive you have is a budget model. While not the worst drive, you'd probably have a much smoother experience with a 2X SCSI drive like an NEC. My biggest regret from back then was wasting money on a Creative CD-ROM kit, rather than just buying a SCSI 2X drive and a cheap controller. Don't you find the seeking sound of the CDU 31A super annoying?
Also, I looked into the CDU-31A. Although almost all of them were 1X drives, I saw a few references to some of them being 2X drives as well. Yours is a -02 model, so I assume it must be a 2X model. It seems to be the one that came with the computer.
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