Strangely Low SCSI Performance

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For some reason this SCSI drive goes very slow

Here's a scsi drive I picked up off ebay.

It's a Hitachi DK32DJ-72

It's a replacement drive that came in a hot-swap caddy for some high-end Sony transcoding unit.

I connected it to my computer via BOTH an Adaptec 2940 SCSI card and an Adaptec 19160 (not pictured).

It's connected with some kind of SCSI Adapter and SCSI cable I picked up from a local computer shop.

The cable has the markings 2D502 BIZ 10 oCT 01 on it. The 2D502 correlates with a Dell product number.

The SCSI cable has a built in terminator on the end.

Currently, I'm getting strangly low speeds with HD Tach.

Any and all help on this issue is appreciated!

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UPDATE:
One person suggested this drive may have some tweaks to increase RAID performance, but degrade single-drive performance.

This dea sounds very reasonably to me. Hitachi had some utilities on their website, but I was never able to get them to work.