boot disk - meaning and definition. What is boot disk
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What (who) is boot disk - definition

REMOVABLE DISK FROM WHICH A COMPUTER CAN BOOT AN OPERATING SYSTEM
Bootfloppy; Bootable floppy; Bootdisk; Bootable disk; Boot floppy; Emergency boot; Rescue Floppy; Boot disc; Bootable disc; System disk; Bootable USB; Boot floppies; Bootable media; Boot diskette; Boot floppy disk; Boot floppy diskette

boot disk         
<operating system> The magnetic disk (usually a hard disk) from which an operating system kernel is loaded (or "bootstrapped"). This second phase in system start-up is performed by a simple bootstrap loader program held in ROM, possibly configured by data stored in some form of writable non-volatile storage. MS-DOS and Microsoft Windows can be configured (in the BIOS) to try to boot off either floppy disk or {hard disk}, in either order. By default they first check for the presence of a floppy disk in the drive at start-up and try to use that as a boot disk if present. If no disk is in the drive they then try to boot off the hard disk. Some operating systems, notably SunOS and Solaris, can be configured to boot from a network rather than from disk. Such a system can thus run as a diskless workstation. (1997-06-09)
Boot disk         
A boot disk is a removable digital data storage medium from which a computer can load and run (boot) an operating system or utility program. The computer must have a built-in program which will load and execute a program from a boot disk meeting certain standards.
/boot/         
DIRECTORY OF FILES FOR BOOTING THE OPERATING SYSTEM
/boot
In Linux, and other Unix-like operating systems, the directory holds files used in booting the operating system. The usage is standardized in the Filesystem Hierarchy Standard.

Wikipedia

Boot disk

A boot disk is a removable digital data storage medium from which a computer can load and run (boot) an operating system or utility program. The computer must have a built-in program which will load and execute a program from a boot disk meeting certain standards.

While almost all modern computers can boot from a hard drive containing the operating system and other software, they would not normally be called boot disks (because they are not removable media). CD-ROMs are the most common forms of media used, but other media, such as magnetic or paper tape drives, ZIP drives, and more recently USB flash drives can be used. The computer's BIOS must support booting from the device in question.

One can make one's own boot disk (typically done to prepare for when the system won't start properly).