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Disc Drive Device Configuration Jumper

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OK, so I am about to build a new computer and use a pair of SATA DVD drives. I have only had IDE drives in the past...and I remember on those there was a jumper to distinguish a master and slave drive. I see on the pictures of the SATA drives, they have no such jumper. So, how do you distinguish the master and slave drives (or do you)?
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    motto - Just get-er-done

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Sata drives are set by the sata port you plug them into. My Compaq desktop has 2 sata drives. The "C" drove is plugged into the Sata "0" and the second drive is connected to the Sata "2" connector. It really doesn't matter i guess because the computer shows the drives as "c" and "e" with my DVD-RW inbetween as "d". Perhaps if i plugged another HD into my Sata "1" port the drive letters would switch around, but i doubt it because windows already sees the drive as the "e".

If you wanted to be careful just choose the main OS drive for the "0" port and the next drive in the "1" port, so on and so on.

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