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Buck,
I have never been good at understanding IBM terminology; I would guess
that IBM is using "arm" to mean some logical or virtual analog to a
real-life, physical arm. In case you're wondering about physical disk
arms, I think Roberto is mostly right in that conventional,
consumer-grade hard disk drives tend to have multiple platters, with a
head for each accessible surface, but all those heads are on one
physical arm:
http://en.wikipedia.org/wiki/File:Hard_drive-en.svg
http://en.wikipedia.org/wiki/File:Hard_disk_dismantled.jpg
http://en.wikipedia.org/wiki/File:Kopftraeger_WD2500JS-00MHB0.jpg
Or, if you just want to read the article yourself:
http://en.wikipedia.org/wiki/Hard_disk_drive
As noted by others, there have been and may still be other designs.
(I have no idea what is in real-world use in enterprise-level
storage.)
If all this stuff is too rudimentary and/or irrelevant to the
question, well, I guess I'm testing the bounds of what constitutes a
stupid answer.
John
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