On 02/02/2023 at 19:52, Wols Lists wrote:
Drives now are "Constant Head Speed" not constant rpm. I'm guessing,
Source ?
"Constant linear velocity" (CLV, as opposed to "constant angular
velocity" - CAV) is adapted for use requiring a constant transfer rate
such as media recording or playback, not random access, and is mostly
found in optical disc drives.
that what it means is that for the inner tracks it spins at 7200, and as
the heads move out, the rpms slow down to keep the speed the head is
going over the platter constant.
It also implies that the spindle is able to accelerate from the lower
speed (around 3600 RPM) to 7200 RPM or decelerate from 7200 to 3600 RPM
in less than the full stroke time, which is around 20 ms in order to not
degrade the access time. It sounds highly unlikely to me.
