The humble hard drive has really evolved over the years. It has been growing in capacity and spindle speed, reducing the power consumed, and has improved MTBF (mean time between failure) and reliability. Today, you can't just take a desktop drive and place it in a storage array or a server, just because it has the required spindle speed and capacity. You have to first understand the difference amongst different types of hard drives before zeroing in on the right one.
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