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read/write head

[reed-rahyt]
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noun Computers.
  1. an electromagnetic device, as in a disk or tape drive, that reads data from or writes data on a magnetic disk or tape.
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Also called head.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
British Dictionary definitions for read-write head

read-write head

noun
  1. computing an electromagnet that can both read and write information on a magnetic medium such as magnetic tape or disk
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012