Comment Re:360K already double-sided (Score 1) 173
No, I had a Teac DSDD drive on my TRS-80 Model I. I had to build a custom disk controller to support it though. This was in '80, so it predated the IBM PC by about a year and a half. Also, the PC used soft sectors, didn't it? The TRS-80 drive controllers were all hard sector.
I also had a Shugart 35-track SSDD drive, if I remember correctly.
It's obviously been a while, but I remember 35 track hard sector SSSD, 40 track hard sector SSSD, 40 track hard sector SSDD, and the brilliant Holy Grail of 40 track DSDD.