Join Date: May 2000
Location: Albany NY area USA
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I think your math is basically right (including your bits --> MB conversion), the confustion is that 650MB is a limit in the file system for CD-ROM. Once you've added the overhead of a PC filing system for storing data files instead of a music bitstream with track markings, you lose a lot of space. Take for instance a hard drive, there are actually 3 (or more) different numbers a marketer could tell you about the size:
1. the unformatted capacity in millonbytes (bytes x 1,000,000) eg 700MB
2. the unformatted capacity in Megabytes (bytes x 1,048,576) eg 667MB
2. the formatted capacity in Megabytes (bytes x 1,048,576 - FAT overhead) eg 610MB
That's a big difference in perceived size caused by just naming differences (and which scheme do you think the advertisers use?).
I don't know this is the full cause of the discrepancy between 650MB and your 764MB figure, but I do know that the formatting causes SOME overhead differences between music and data.