Re: 3174 disks

"Al Kossow [email protected] [hercules-390]" <[email protected]>
Newsgroups gmane.comp.emulators.hercules390.general
Message-ID <[email protected]> 
On 6/28/19 11:38 AM, Ivan Warren [email protected] [hercules-390] wrote:

>>  1.  What format are the 3174 disks?  I know they're 2.4MB drives, but
>>     are the floppies actually 2.4MB?
>>
> They probably have a non disclosed format, but the block sizes are
> probably pretty standard (512 Bytes/block). They are double sided 5.25
> soft sectored HD (1.2MB per side). Cloning a diskette should be pretty
> easy.

I was able to sort of read a 2.4MB disk in a 2.4MB drive with a flux-level
reader to determine they have twice the number of sectors/track as a 1.2MB
disk.

Getting the IBM drive to switch into 2.4MB vertical record mode is the mystery.





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