Removing the jumper usually means it's the master. Not good if you want it the slave of that set of disks.
Make sure the primary drive within the computer is either cable select or master and the second one is cable select or slave.
If you have the primary drive's jumper set to cable select and have it on the wrong set of connections on the cable, that may screw it up.
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UNIX - Not just for Vestal Virgins any more