Well, that would be "spot on", as the formatted capacity of an ST-251 was 40 Megabytes.

When used with MS-DOS, prior to MS-DOS 3.31, it would be partitioned as two 20MB, or as a 32MB plus an 8MB. (V3.31 was the first version of MS-DOS to support a partition larger than 32MB)


On Tue, 16 May 2023, Mike Katz wrote:

The biggest drive I remember seeing on OS/9 was 20MB or 40MB.  I don't remember the File Allocation Table size or format.

On 5/16/2023 7:14 PM, Fred Cisin via cctalk wrote:
On Tue, 16 May 2023, Mike Katz via cctalk wrote:
Most likely there was some kind of driver for the CoCo that converted the ST-251 into smaller logical drives for the CoCo Operating system.

One fellow, who used to be involved in Cocos, recalls one or more systems that handled it by MANY "virtual floppies" on the drive.

I think that OS-9 may have had support for "big" drives.

--
Grumpy Ol' Fred             ci...@xenosoft.com

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