With over 27,000 drives on hand, Backblaze last year published the most comprehensive independent test results I’ve seen for consumer-grade hard drives. Hard drives aren’t all created equal, and they aren’t built to last forever: good drives typically last for around three years of very active use, and great ones for five years.
Without a computer or another enclosure surrounding them, these hard drives are called “internal hard drives.” They’re small metal boxes akin to old-fashioned record players, with one or more spinning disks (“platters”) that get accessed by a “ read/write head” (shown above).
The vast majority of Macs in homes have mechanical hard drives (rather than chip-based SSDs) inside.
Photo credit Eric Gaba, Wikimedia Commons user Sting A Quick Primer On Internal Hard Drives
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