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3.16 How do I swap A: and B:




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This item is from the PC Hardware FAQ, by Willie Lim and Ralph Valentino with numerous contributions by others. (v1.25).

3.16 How do I swap A: and B:

[From: rgeens@wins.uia.ac.be (Ronald Geens)]

To swap A: and B: drives :

1) open up your machine to see if look at the cable that interconnects the 2 drives.

2) if the cable is twisted, there is no problem, just switch the connectors from 1 drive to the other.And change the bios-setup.

[Note: "B:" is in the center of the cable, "A:" is at the end, after the twist.]

3) if the cable isn't twisted (which is very,very rare), it's a little harder: leave the cables as they are, but change the jumpers on the drive. (this sounds a lot tougher, but it can usually be done without to much hassle. When the cable connecting the 2 drives is just a flat one (like the harddisk cable) then you must play with the jumpers on the drives: Most of the time, there is a jumper with 4 pins, with the following layout:

                               _
                              |1|
			     |2*3|
                              ---

Where the * is the 4th unnumbered pin. Normally the A: drive will have a jumper on pin 2 & 4 and the B: drive on 1 & 4. Just change these jumpers around, (i.e. new A: 2&4, new B: 1&4) and change the BIOS configuration.

4) Don't panic if it doesn't work, just make sure all cables are conected properly and if that doesn't work just restore everything to its old state. PS. By twisted cable, I mean that between the A: and B: drive, a few wires of the flat cable are turned around.

[From: sward+@CMU.EDU (David Reeve Sward)]

I have found two ways to do this: I originally switched their positions on the cable attached to the controller, and changed the BIOS to reflect this. I recently got a gsi model 21 controller for my IDE drive, and this controller allows you to specify which drive is A: and B: in software (it lights the LEDs in turn and asks which is A: and which is B:). This did not require a cable change (but I still changed by BIOS).

 

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