Disc Imaging / Kryoflux - Acorn ADFS 800KB

Peter Coghlan cctalk at beyondthepale.ie
Sat Jul 2 16:15:46 CDT 2016

> Is the capacity of the diskette 800K? or is that merely the name of the 
> type of the diskette, with an actual capacity of somewhere between 640K 
> and 800K?
> If the actual capacity is 800K, with MFM, then it would probably be 80 
> track, double sided, with either 10 512 byte sectors or 5 1024 byte 
> sectors per track.  (can't get up to 800K with "normal" WD style MFM with 
> 256 bytes per sector, and 512 byte sectors are a little tight)

The original ADFS had 16 sectors of 256 bytes per track. However, it appears
that more recent ADFS formats use 5 sectors of 1024 bytes.  There are more
details here:


Peter Coghlan

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