Its a cable that normally you plug the middle connector into the mobo and each end goes to a drive. Compaq uses them, and some others. Actually all it is, is a cable with the "CSEL" wire cut before one of the drive connectors. If a drive sees this line as grounded, it becomes "master" , if it is open, it becomes "slave". The wire in question is #28. You can make one if you want, form a noraml cable, just cut wire #28 before the last connector, and that will go to the "slave" drive, the middle connector is "master" and the other end goes to the mobo. I think its done so all drives can be set-up the same at the factory.
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