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What was the head/track/sector layout of the ST506? Rpresser 15:06, 20 June 2007 (UTC)

153 tracks per surface
4 surfaces (heads) per drive
10,416 bytes per track unformatted
typically formatted with 32 sectors per track and 256 bytes per sector.
The ST506 was a "dumb" interface so the user capacity depended upon the controller to which it was attached. The above comes from the ST506 Service Manual[1], May 1982Tom94022 21:10, 20 June 2007 (UTC)


  1. ^

Seagate or Shugart?[edit]

The ST506 and ST412 manuals that I have looked at (through bitsavers) indicate that the drives were Seagate.

It looks to me that Shugart drives were numbered with SA, and Seagate with ST, further evidence for Seagate.

I don't know when the change was made, though.

Gah4 (talk) 21:27, 17 January 2008 (UTC)

Shugart Associates [f. 1973], later Shugart Corporation is a different company than Seagate Technology originally Shugart Technology [f. 1979]. Alan Shugart was a founder of both. Tom94022 (talk) 17:00, 18 January 2008 (UTC)

Yes, but which company is responsible for the ST506 and ST412?

Gah4 (talk) 04:28, 14 February 2008 (UTC)

Seagate Technology Tom94022 (talk) 06:08, 14 February 2008 (UTC)


Out of curiosity, how much did one of these cost in 1980? I imagine they weren't available to the public, and so researching the cost would be hard, but perhaps someone reading this was actually there, in 1980, and can provide a source. -Ashley Pomeroy (talk) 23:21, 1 January 2011 (UTC)

The Seagate Sept 24, 1981 Prospectus gives the FY1981 revenue of $9.9 million for approximately 13,000 drives or an ASP of about $750. The claim then was that this was the first HDD priced below $1000 which probably was true although the Shugart SA1000 or the Memorex 101 may have beaten it below that threshold. Tom94022 (talk) 00:07, 2 January 2011 (UTC)