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disk operating system
disk op·er·at·ing sys·tem (plural disk op·er·at·ing sys·tems)


noun 
Definition:
 
computer operating system: an operating system for personal computers that uses disks and diskettes for storage of programs and data
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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