there are 2 drives, i installed the second one myself,

also i used some clear silicon glue on the ide connector on the drives, this becuase the silicon stays flexible and is easy to remove.. i used the clear type as it is the most weak of all types.. you can get greay, white and red types...

i prefered silicon to hot melt glue do to that vibrations could break of the hot melt glue as i cools down and get hard
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the "monkey" who learned to check a harddrive