Substituting DSHD for DSDD disks (or DS2D if you prefer)

Chuck Guzis cclist at
Mon Oct 26 11:50:32 CDT 2015

On 10/26/2015 01:04 AM, COURYHOUSE at wrote:
> and the  first  hp-150 drive set,   the  hp-9121, was single sided
> double density SS/DD discs (270Kb).
> sure was glad  when the  9122 came  out!

I supsect that the Sony SMC-70 may have been among the first systems to 
come out with the things.

Fortunately, I still have several cartons (duplicator grade) of blank 
DSDD 3.5" mdedia.  A few months ago, I gave away (FFS) about 1,000 of 
the things.

I suspect that the the world's supply is far from exhausted.  Lots of 
common word processors also used them (e.g. Brother).


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