> On Feb 1, 2022, at 12:16 PM, Mike Katz via cctalk <cctalk@classiccmp.org> > wrote: > > In the rotating drive world there is constant linear velocity (CLV) and > constant angular velocity (CAV) drives. > > On CLV drives the speed of rotation would vary based on the track (slower in > the inner tracks and faster on the outer tracks). This meant that the data > rate and number of bits/track remained constant. Slower on the outer tracks, I believe. CDs work this way. > On CAV drives the rotational speed of the drive doesn't change, this means > that the data rate and number of bits/track changes depending on the track. It means that only if the sector count changes. That's true for modern drives and for the CDC 6603; it wasn't true for quite a while. A lot of "classic" disk drives have constant sector counts. So, for example, an RP06 is a CAV drive and its transfer rate is independent of cylinder number since the sector count per track is constant. I think hard drives are CAV as a rule because changing the spin rate as part of a seek takes too long. paul
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