How to Switch the Main Hard Drive if Your Computer Has Two
Computer hard drives run on a single data channel called an IDE port. When there are two drives installed in the computer, there will be a primary drive called the "Master" and a secondary drive called the "Slave." This sets data transfer priority between the drives. Changing this requires that you change the settings on the back of the hard drives from within your computer.
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Instructions
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1
Turn off the computer and disconnect the plug from the wall.
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2
Remove the screws on the rear of the case and remove the side panel.
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3
Change the jumper position on the back of your primary drive to the "Slave" setting.
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4
Change the jumper position on the back of your secondary drive to the "Master" setting.
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