![]() ![]() Although the basic concept of spinning magnetic disks accessed by a movable stack of disk heads has not changed, hard drives have become much more complex to enable the increased density and performance. Since then, the capacity of a 3.5″ drive has increased by about 10 6 times (from 10 MB to about 10 TB), sequential throughput by about 10 3 times, and access times by about 10 1 times. ![]() While hard drives have been around since the 1950s, the current 3.5″ form factor (actually 4″ wide) appeared in the early 1980s. Modern hard drives store an incredible amount of data in a small space, and are still the default choice for high-capacity (though not highest-performance) storage.
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