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I have an Adaptec 19160. It's running my Cheetah Ultra160 LVD 18GB drive, the Narrow-SCSI Plextor and externally, my narrow ZIP and MicroTek scanner.

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FWIW: I remember reading an article in Linux Journal . It was about building an ultimate performance box. One of the things they mentioned was that mixing Narrow and Ultra devices on the same bus caused all devices on the bus to degrade to the Narrow performance. Based on that, I suspect your Ultra160 LVD drive isn't performing at its max.

Here's the quote and the link to it.

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by Eric S. Raymond

LVD drives can drive the bus at 40MHz and 80MHz, whereas single-ended cannot. If you mix single-ended and LVD, the bus degrades to single-ended. So a bus with a single-ended device tops out at 20MHz Wide SCSI or 40MB/s, whereas LVD gets you up to 160MB/s.

http://www.linuxjournal.com/article.php?sid=5420

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