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The speed of a storage drive/hard drive/hdd is measured in RPMs or Revolutions Per Minute. The faster the RPM, the faster the drive can can access data.

Most laptops have 5,400 RPM HDDs while some have 7,200 RPM HDDs.

Most dektop computers have 7,200 RPM ones while some top of the line models run at 10,000 RPM (such as the Seagate Velociraptor)

There are also Solid State Drives (SSDs) which are just beginning to become popular that contain no moving parts. These speeds are measured in Mb/s which rates how much data can be transferred per second. HDDs can also be measured in this way but RPM speed is more common. SSDs also have separate read and write speeds

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