Quote:
But I wonder if there is a tool, either on the player or that I could add to the player, that will nondestructively test the hard disk sectors?


Assuming that the fsck program on the player supports it, you can pass the '-c' switch to fsck.ext2, which will cause a read-only block test. If you pass it twice, you get a non-destructive read-then-write test.
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-- roger