1 Feb
2022
1 Feb
'22
10:03 a.m.
On 2/1/22 09:16, Mike Katz via cctalk 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.
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.
I suspect that most recent ATA and SCSI drives employ "Zoned" recording.
That is, the disk is divided up into several annular "zones", each with
its own data rate. The rotational speed remains constant, however.
This is not even recent. The old Bryant 4000 disks used such a scheme
and it was used on many old drives after that.
--Chuck