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A sector is the most basic physical I/O unit on a disk
Files are linked lists on the disk; reading/writing one sector at a time would be very slow
Clusters are logical groupings of sectors by an operating system to optimize I/O
Typical hard drive cluster sizes range from 4 to 64 sectors (2-32 KB)
But they result in empty space slack at the end of a file...
...and a data hiding opportunity.
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