I would have to agree with what everyone else is saying about the firmware. My IBM Thinkpad has a HD locking feature that is separate from the BIOS and any software security I might have.
I don't know about Hitachi, but for my IBM drive the only way to get the data back is either put the platters in another drive or replace all the electronics on the drive. That's probably why that company has a cleanroom.
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"Empirically observed covariation is a necessary but not sufficient condition for causality" - Edward Tufte
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