magnetic disks

Collins
World English Dictionary
magnetic disk
 
n
computing another name for disk

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
magnetic disk  
A memory device, such as a floppy disk or a hard disk, that is covered with a magnetic coating. Digital information is stored on magnetic disks in the form of microscopically small, magnetized needles, each of which encodes a single bit of information by being polarized in one direction (representing 1) or the other (representing 0).
The American Heritage® Science Dictionary
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