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I am trying to find a tool to move the head of my hdd up and down as much as possible. I have tried CrystalDiskMark, but the head only moves on the outer edge of the disk.

Is there some way (a tool maybe?) to perform more extreme reads? E.g. turning of all caches and demanding a sector from the outer area and then from the inner area and so on?

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The whole point from the on-disk logic is to avoid that. Which means that if I take an old SCSI drive and ask for sectors 1, 999999 and 2 -> drive reads 1, 2, and 999999. –  Hennes Jan 13 '13 at 14:12
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And deliberately shorten the life of your drive? Why? –  Xyon Jan 13 '13 at 14:24
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@Xyon It's an 20GB disk, that I opened for educational purposes, but a demonstration of the worst file seek scenario would be nice. –  Franz Kafka Jan 13 '13 at 14:29
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up vote 3 down vote accepted

HD Tune (amongst others) is a hard disk benchmarking tool that claims to have a 4KB Random Seek test that should do what you are after.

If your head is only moving in the first area of the disk then make sure that your partition spans the entire disk.

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