Early 3.5" Floppy Drives

Chuck Guzis cclist at sydex.com
Tue Dec 13 11:55:15 CST 2005


On 12/13/2005 at 8:39 AM mbbrutman-cctalk at brutman.com wrote:

>Quoting Fred Cisin <cisin at xenosoft.com>:
>
>> The "official", "standardized" support of 3.5" 720K in 3.20 was with use
>> of DRIVER.SYS and/or DRIVPARM.  DRIVPARM was incompatible with IBM's
>BIOS,
>> and therefore was undocumented in PC-DOS.
>
>Do you remember the details of the problem with DRIVPARM?

IIRC, the definition of cluster size and therefore FAT length differed
between PC-DOS and MS-DOS at one point; i.e., there was the iBM 720K and
then there was the Microsoft 720K  format.

Cheers,
Chuck






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