Page "Nibble" Paragraph 6
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Wikipedia
Historically, there have been cases where the term " nybble " was used for a set of bits fewer than 8, but not necessarily 4.
Writing data to a disk was done by converting 256-byte pages into sets of 5-bit or, later, 6-bit nibbles ; loading data from the disk required the reverse.
Note that the term byte also had this ambiguity ; at one time, byte meant a set of bits but not necessarily 8.
Today, the terms " byte " and " nibble " generally refer to 8-and 4-bit collections, respectively, and are not often used for other sizes.
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