Seagate ST-4096 microstepping mode FYI

[Al Kossow]

I just uploaded manuals for the st-4038 and 4096 and noticed the 4096 lets you microstep the
head if you assert J1-16. The 4038 just marks pin 16 as reserved.

I don't know of any other embedded servo st-412 interfaced drive that had that ability.

[Al Kossow]

s/embedded servo/servoed/

[Al Kossow]

I uploaded an article I found from Seagate this morning on ST-412 HP
This came out around the same time as ESDI, so I don't think it ever caught on.
http://bitsavers.org/pdf/segate/ST-412HP_Comp_Design_198404.pdf

[nosn...@gmail.com]

I tried going to the link - 404

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[David Gesswein]

Looks like it ended up here. Bitsavers is browsable.
http://bitsavers.org/pdf/seagate/mfm/ST-412HP_Comp_Design_198404.pdf

> To view this discussion on the web visit https://groups.google.com/d/msgid/mfm-discuss/003801d9f302%2449886520%24dc992f60%24%40gmail.com.

[Al Kossow]

On 9/29/23 11:25 AM, nosn...@gmail.com wrote:
> I tried going to the link - 404

typo
http://bitsavers.org/pdf/seagate/ST-412HP_Comp_Design_198404.pdf

[David Gesswein]

Finally some actual details on what recovery does. Looks like 2/10's of a
track is most it pulls the head. May not match what the earlier drives do.
So far I haven't found recovery helps that much with the misalignment seen now.

Anyone ever seen a ST8100 which implmented the higher bit rate MFM interface?

On Fri, Sep 29, 2023 at 02:25:12PM -0400, nosn...@gmail.com wrote:

> To view this discussion on the web visit https://groups.google.com/d/msgid/mfm-discuss/003801d9f302%2449886520%24dc992f60%24%40gmail.com.