That was for a completely different reason. CDs had Constant Linear Velocity (CLV). This means the disc would spin lower when the head was on other tracks, and

That was for a completely different reason. CDs had Constant Linear Velocity (CLV). This means the disc would spin lower when the head was on other tracks, and faster on inner tracks, so that the same amount of data would pass under the head every second. This was a-OK until 8x or 16x and became really insanely pointless around 24x - with the disc being vigorously accelerated and brakes as the head moved from region to region. At some point some manufacturer rightly decided “to hell with this idiocy” and made a CAV unit - Constant Angular Velocity - the disc would spin at Always the same rate, and if this means outer tracks read faster than inner ones, well, who cares. The whole industry soon followed - there was no point in staying CLV.