On Thu, 12 Jul 2007 14:34:17 -0400, J R wrote: >Well, I was always aware of the trade-offs, i.e. bit density >at the center v. bit density at the outside, but I wasn't >aware that anything was ever done about it with variable >data rates, etc. > CD players, like the original Macintosh 390 K floppy disks, vary the angular velocity inversely with cylinder radius in order to have both uniform linear density and uniform data transfer rate.
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