hard-disk

hard disk

noun Computers.
magnetic disk ( def 1 ).

Origin:
1980–85

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World English Dictionary
hard disk
 
n
a disk of rigid magnetizable material that is used to store data for computers: it is permanently mounted in its disk drive and usually has a storage capacity of a few gigabytes

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
hard disk   (härd)  Pronunciation Key 
A rigid magnetic disk fixed within a disk drive and used for storing computer data. Hard disks hold more data than floppy disks, and data on a hard disk can be accessed faster than data on a floppy disk.
The American Heritage® Science Dictionary
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