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1) No need to turn the PSU rocker switch off... if you do, you will have to replace the motherboard's backup battery more often as the PSU supplies a small current that holds CMOS memory in place taking the load off the battery. (plus a few other monitoring functions) i.e. booting the computer from a hot-key command.
2) Over time as the drive is used and data written/deleted...etc.. the read/write head has to do a little more work and as a result will become more audible as it moves around searching for data.
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