I'm thinking about putting the SATA HDD from my dead laptop into my desktop tower for some extra storage (I'm using the CM HAF X, which comes with a couple options for mounting 2.5" drives). My only concern is the voltages. From what I understand, 3.5" drives use both +12 V and +5 V, whereas 2.5" ones only use +5 V.
Would this be a problem, or would the 2.5" drive just ignore the +12 V and run off the +5 V?
As kitsunestarwind said, Laptop and Desktop drives are the same, data transfer connection, power transfer connection. You have a converter that makes the connections on one drive plug into the other computer, and you are done.