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Depends: are you talking about the hard drive's spin speed, or the speed of data transfer? The first would be "rpm", meaning "rotation per second", while the second is measured in Mbit/s or Gbit/s, I seriously hope you're familiar with the notion of Mbit and Gbit (in the '90s MB and GB, megabyte and gigabyte were used mainly everywhere, which were replaced by megabits and gigabits when talking about data transfer, not static data, this is why I'm asking, no harm intended).

The two units don't have a universal relationship between them, except for the fact, that when a hard drive spins faster, it is capable of a higher transfer speed.

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