I recently purchased a SCSI hard drive, 18Gb IBM DGHS-18Y. Its ID is set to 2, and if I understand the documentation correctly, it is self-terminating (take that, Arnold!). Also, it is plugged in to an Adaptec 2930 (there is a 50-pin adapter on the drive itself) in a B&W w/XLR8 G4/500.
1. Hitachi/IBM's compatibility guide says the drive is usable with the Adaptec 2940 controller, not the 2930. Probably moot tho, as the drive works on OS 9.
2. Hitachi/IBM's "Ultrastar 9LP & 18XP (LVD) Quick Installation Guide v2." which covers your DGHS-18Y model, does NOT say the drive is self-terminating. It in fact says "Note that the using system is responsible for making sure that all required signals are terminated at both ends of the cable."
So... The controller terminates the chain at its end. But you MUST set termination on the drive. I think you'll find the pins for it on that adapter.
Keep in mind that if you have a VERY short SCSI chain, you can often get away (specification-wise) without terminating both ends. This sometimes works fine with the drivers used by OS 7/8/9. But I've never seen it work with any *nix, including OS X.
This is not all to say you might still have a driver or other software issue... but terminating that drive is a good start.
G'luck, - Dan.
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