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On early Macs without an internal hard drive, the computer boots up to a point where it needs to load the operating system from a floppy disk. The Mac displays a floppy disk icon with a blinking question mark until the user inserts the correct disk. [23]
A modern PC is configured to attempt to boot from various devices in a certain order. If a computer is not booting from the device desired, such as the floppy drive, the user may have to enter the BIOS Setup function by pressing a special key when the computer is first turned on (such as Delete, F1, F2, F10 or F12), and then changing the boot order. [6]
Some classic Mac OS versions also come with a file system translator to handle this file system. A volume is allocated in 512-byte blocks. (5.25" floppy disks are still formatted using 256-byte sectors, as this is the format required by the controller ROM to boot the disk. ProDOS simply treats pairs of 256-byte sectors as a single block on such ...
Apple [1] Disk Image is a disk image format commonly used by the macOS operating system. When opened, an Apple Disk Image is mounted as a volume within the Finder.. An Apple Disk Image can be structured according to one of several proprietary disk image formats, including the Universal Disk Image Format (UDIF) from Mac OS X and the New Disk Image Format (NDIF) from Mac OS 9.
A self-booting disk is a floppy disk for home computers or personal computers that loads—or boots—directly into a standalone application when the system is turned on, bypassing the operating system. This was common, even standard, on some computers in the late 1970s to early 1990s.
Those Macintoshes include a ROM chip varying in sizes up to 4 megabytes (MB), [8] which contains both the computer code to boot the computer and to run the Mac OS operating system. The ROM-resident portion of the Mac OS is the Macintosh Toolbox and the boot-ROM part of that ROM was retroactively named Old World ROM upon the release of the New ...
If a bootable disk is found, the Happy Mac logo is displayed, and control is handed over to the Mac OS. If no disk to boot from is present, an icon depicting a floppy disk with a blinking question mark in the middle will be displayed.
Five structures make up an HFS volume: Logical blocks 0 and 1 of the volume are the Boot Blocks, which contain system startup information. [2] For example, the names of the System and Shell (usually the Finder) files which are loaded at startup. Logical block 2 contains the Master Directory Block (also known as MDB). This defines a wide variety ...