The drives that are used in our machines are now all 2.5" laptop drives. It was found that they are built to withstand much more of a beating than 3.5" drives. The machines they are in are usually left on continuously. Drive failures are really uncommon after the settling in time.
Because the disks are smaller, there is less load on motors and bearings. The cabling is easy with an adaptor and they run on 5v only.
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