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The idea of using two controllers, and having each drive set up as primary, means that you can interchange drives between the main and ultrabay without changing ID jumpers, as well. Richard At 03:40 PM 1/30/97 -0500, you wrote: >> Once I remove the second hard drive from the UltraBay and reboot, I can >> use either modem and I can turn the serial and parallel ports back on. >> >> I sounds like a irq conflict, but nothing I see indicates that the >> second hard drive has its own irq. Why should it? > >It does. The UltraBay uses a second IDE controller, commonly strapped >to IRQ 15 (the primary is usually at IRQ 14). Thus, when your ThinkPad >has two hard drives inside it, both drives are masters on the primary >and secondary IDE controllers > >The reason for this is probably historical: I suspect that the slave >position on the primary controller is allocated to the IDE drive in >the optional docking stations, which predate the UltraBay in the 760 line. >