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I had a machine awhile back that I had two master drives. I had both jumpered as master and on the same IDE channel. I wired in a DPDT switch with a center off. The switch contacts broke the red and yellow wires and left the blacks intact. When the switch was in the center off position, neither hard drive would be powered, and there would be no boot. (I did it like that so that I could connect a third drive in the system to fdisk, format or whatever..without seeing the other two.) With the switch in the up position, I ran one hard drive with its OS and if I wanted the other drive, I had to shut down, flip the switch to the down position and reboot. Worked like a champ..these were IDE drives also.
From this arrangement, I would think a slave drive could easily be set up with a switch to open or close the red and yellow wires going to the molex socket for the slave drive. Be aware however, the machine will need to be shut down, the switch set to power the drive and then the system rebooted before the system will know the drive is attached..it does not work like USB.
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