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Might be worth mentioning,
issuing a SMART command.
Using CDB pass-through, I think this can be done using existing standard
driver pass-throughs
I have no less awful compromise to suggest ... but I don't want to help oversell this choice thru silence.
I think this theory holds up only on platforms that support CDB pass thru to the device in question e.g. Windows and Linux.
For PDT x00 HDD in particular, no matter if RMB or not, an application requirement for SCSI pass thru as yet excludes Mac OS X as delivered. There you have to roll your own kext (analogous to a Window sys) and install it, like people do for the Apple iPod's. That Mac OS X limitation by design is the main spark in the flame wars that perennially plague:
http://lists.apple.com/mhonarc/ata-scsi-dev/
The in-my-humble-opinion-nonsensical thinking offered as a O.S. design rationale is:
http://developer.apple.com/qa/qa2001/qa1179.html is t
Pat LaVarre
P.S. I'm sharing my personal opinion here, I do not speak for my ISP.
