From a closed thread ( otherwise, I would answer it there) :

Subject: RE: BS: Free speech- as long as you're Liberal.
From: Joe Offer - PM
Date: 26 Sep 17 - 04:02 AM

I never catch onto these Internet acronyms that everybody seems to know about. I Googled "SSDD," and found it means "single-sided, double-density."

I think that's how they used to distribute the Digital Tradition, back in the day.

I'll get me coat....

-Joe-
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As far as I know, the initial distributions of the DT were DSSD 5 1/4 floppies ( 360Kbytes each). On request, on later we used DSDD (720Kbytes) or DSQD (1.44 MBytes) 3 1/2 floppies ( which are in a hard shell). I believe that the last distributions have been on CD-ROM.

I was making floppy copies at the Getaway before Mudcat. Zenith 248, with both 5 1/4 and 3 1/2 drives.