Five and quarter drives

From: Randy McLaughlin <randy_at_s100-manuals.com>
Date: Fri Feb 11 18:47:43 2005

From: "Eric Smith" <eric_at_brouhaha.com>
Sent: Friday, February 11, 2005 6:30 PM
> Dwight wrote:
>> Also, not mentioned is that I believe the rotation
>> rate is different for the two drive. (360/300 rpm or something)
>
> There are two kinds of 1.2M (HD) 5.25-inch drives:
>
> 1) Some drives use a pin on the bus to signal which motor speed
> (300 or 360 RPM) to use, so that a host can handle DD and HD disks at
> the normal 250 Kbps and 500 Kbps data rates.
>
> 2) More commonly, the drive does a fixed 360 RPM, which means that HD
> disks use a 500 Kbps data rate, but DD uses 300 Kbps (rather than the
> normal 250 Kbps at 300 RPM).
>
> Eric

When the PC-AT first came out there were two different types of 1.2M drives:

360RPM using 600K transfer rate & 300RPM using 500K transfer rate.

Gets confusing doesn't it?


Randy
www.s100-manuals.com
Received on Fri Feb 11 2005 - 18:47:43 GMT