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Wiktionary
bootable

a. (context computing of a disk, etc. English) That can be booted; from which one can boot the system. n. (context computing English) A disk or other medium from which the system can be booted.

Usage examples of "bootable".

Your computer notices a bootable disk in the floppy or CD-ROM drive, loads in some object code from that disk, and blindly begins to execute it.