There are a few different applications that can aid you in doing this. Here is one. http://www.accurite.com/AAD.html Most often than not, the heads will not be realigned properly with such software, and the cost of purchasing the mechanical tools to do it manually and the time and energy it takes outweigh the cost of just buying a new drive. If you are having read/write problems, and an inexpensive head cleaner (http://pc-extras.com/prods/cl35ck.html) does not solve the problem, I would recommend replacement.
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