Some storage devices can access data very quickly, whilst others are extremely slow...
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* Note: Modern back-up tapes have very fast access speeds, but only to save/read data sequentially (they are serial access devices). Tapes are very slow if you want to read files out of order, since the tape has to be rewound and fast-forwarded.
Access speeds are measured in bytes per second (Bps).

Slow devices have speeds measured in thousands of Bps (kBps).

E.g. a floppy disc can save/read data at a speed of 60kBps

Fast devices have speeds measured in millions of Bps (MBps).

E.g. a hard-drive can save/read data at a speed of 300MBps (5000 times quicker than the floppy!)

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