"Extra ultra density"? (was: RX50 Replacement

From: Fred Cisin <cisin_at_xenosoft.com>
Date: Tue May 8 14:22:30 2001

On Tue, 8 May 2001, Tony Duell wrote:
> > What is DSQD? Double Sided Quad Density??
> Yes. It generally means (on 5.25" disks) MFM recording at 96tpi (so 80
> cylinders).
>
> Question : What would you call single density recording (FM) at 96 tpi on
> such a disk? Givem that 'double density' normally means MFM recording at
> 48 tpi

Intertec (Superbrain) called their format "QUAD density" when they went to
double sided on their MFM 48 tpi.
So, then when they came out with a 2 sided MFM 96 tpi format (720K), since
they had used up the name QUAD, they called it "SUPER density", which they
abbreviated "SD"!

--
Grumpy Ol' Fred        cisin_at_xenosoft.com
Received on Tue May 08 2001 - 14:22:30 BST

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