Requirements:
T6 and T10 Security Screwdriver
Xbox 360 Slim
Fat Xbox 360 Hard Drive
A Brain

STEP 1:
Remove the 4 Screws on the Bottom of the Fat Xbox 360 Hard Drive with the T6
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STEP 2:
Take off Cover and remove the next 4 Screws with the T10
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STEP 3:
Posted Image
Lift the back part of the hard drive up so it will let you slide the hard drive out without damaging it
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STEP 4:
Disconnect the Connector from the Hard Drive and Slide the hard Drive out carefully
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now you should have just your hard drive available


STEP 5:
Now you want to align your connectors up with the ones on the inside of the Slim Console
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Now you want to Snap the hard drive into place by aplying pressure to the hard drive till the connectors are connected dont apply to much pressure tho [ Register or Signin to view external links. ]

STEP 6:
Then you want to load up your Xbox 360 Slim and go to System settings and memory to check if its there
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and then you should see the hard drive with the microsoft name on the option
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Now your all done and you have more memory for your Xbox Slim and you dont have to spend 200 bucks on a new 120 or something