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Target Disk Mode (sometimes referred to as TDM or Target Mode) is a boot mode unique to Macintosh computers. When a Mac that supports Target Disk Mode [1] is started with the 'T' key held down, its operating system does not boot. Instead, the Mac's firmware enables its drives to behave as a SCSI, FireWire, Thunderbolt, or USB-C external mass ...
A Happy Mac is the normal bootup (startup) icon of an Apple Macintosh computer running older versions of the Mac operating system. It was designed by Susan Kare in the 1980s, drawing inspiration from the design of the Compact Macintosh series and from the Batman character Two-Face . [ 10 ]
In 1998, Apple introduced HFS Plus to address inefficient allocation of disk space in HFS and to add other improvements. HFS Plus is still supported by current versions of Mac OS, but starting with Mac OS X , an HFS volume cannot be used for booting , and beginning with Mac OS X 10.6 (Snow Leopard), HFS volumes are read-only and cannot be ...
A hidden Hierarchical File System (HFS) disk volume contained in the read-only memory (ROM) includes System 6.0.3. [20] The Mac Classic can be booted into System 6.0.3 by holding down the ⌘ Command+⌥ Option+X+O keys during boot. [20] Some dealers included a software bundle called Smartbundle with the Classic. [21]
The Macintosh contained a single 400 KB, single-sided 3 + 1 ⁄ 2-inch floppy disk drive, with no option to add any further internal storage, like a hard drive or additional floppy disk drive. The system software (Mac OS) was disk-based from the beginning, as RAM had to be conserved, but this "Startup Disk" could still be temporarily ejected.
Secure deletion of free space or disk using a "zero out" data, a 7-pass DOD 5220-22 M standard, or a 35-pass Gutmann algorithm; Adding or changing partition table between Apple Partition Map, GUID Partition Table, and master boot record (MBR) Restoring volumes from Apple Software Restore (ASR) images; Checking the S.M.A.R.T. status of a hard disk
The Apple Partition Map maps out all space used (including the map) and unused (free space) on disk, unlike the minimal x86 master boot record that only accounts for used non-map partitions. This means that every block on the disk (with the exception of the first block, Block 0 ) belongs to a partition.
Mac OS X finally did away with the whole scheme, implementing a modern paged virtual memory scheme. A subset of the older memory model APIs still exists for compatibility as part of Carbon, but maps to the modern memory manager (a thread-safe malloc implementation) underneath. [6] Apple recommends that Mac OS X code use malloc and free "almost ...
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