the only purchase you need to make is to buy a case for your old hard drive, this is usually under $30 the first thing you need to do is check with your old hard drive uses SATA or IDE connectors, then you're going to buy an SATA are IDE portable hard drive enclosure depending on what you have, you going to get a 2 1/2 inch drive if you got your hard drive from a laptop, and a 3 1/2 inch drive if you got it from a desktop, more expensive enclosures come with more padding and cooling fans to help your hard drive last longer, now all you have to do is put the old hard drive into the enclosure.
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