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2. Apple Partition Map - Wikipedia

   en.wikipedia.org/wiki/Apple_Partition_Map

   Because APM allows 32 bits worth of logical blocks, the historical size of an APM formatted disk using small blocks [3] is limited to 2 TiB. [ 4 ] 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.

3. Macintosh External Disk Drive - Wikipedia

   en.wikipedia.org/wiki/Macintosh_External_Disk_Drive

   The Macintosh External Disk Drive is the original model in a series of external 3 + 1 ⁄ 2-inch floppy disk drives manufactured and sold by Apple Computer exclusively for the Macintosh series of computers introduced in January 1984.

4. Disk Inventory X - Wikipedia

   en.wikipedia.org/wiki/Disk_Inventory_X

   Disk Inventory X is a disk space analyzer utility for Mac OS X 10.3 and later. Inspired by WinDirStat, it shows the sizes of files and folders in a graphical treemap.. Version 1.3 of Disk Inventory X added support for macOS 10.15 Catalina, while the earlier version 1.2 added support for macOS 10.14 Mojave and its dark mode feature.

5. Apple Disk Image - Wikipedia

   en.wikipedia.org/wiki/Apple_Disk_Image

   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.

6. Hard Disk 20 - Wikipedia

   en.wikipedia.org/wiki/Hard_Disk_20

   The Hard Disk 20 (or HD20, as it was known colloquially) contains a 20 MB 3.5" Rodime hard disk which provides over 50 times the data storage of the stock 400 kB disk drive. At the time when the average file size was around 10-20 kB and due to the vast number of those files the HD20 can contain, Apple's original Macintosh File System , which ...

7. OmniDiskSweeper - Wikipedia

   en.wikipedia.org/wiki/OmniDiskSweeper

   OmniDiskSweeper is a freeware disk space analyzer utility for macOS developed by The Omni Group, which recursively searches the filesystem and displays entries sorted and color-coded by size, from largest to smallest.

8. Hard Disk 20SC - Wikipedia

   en.wikipedia.org/wiki/Hard_Disk_20SC

   The 20SC originally contained a half height 5.25" Seagate ST-225N 20MB SCSI hard drive, but was later manufactured with a full-height 3.5" MiniScribe 8425SA 20MB SCSI hard drive. The latter drive was the same size as the drive inside the Macintosh Hard Disk 20, but 10 to 15 MB over what had previously been offered by Apple for the II family.

9. GUID Partition Table - Wikipedia

   en.wikipedia.org/wiki/GUID_Partition_Table

   If the actual size of the disk exceeds the maximum partition size representable using the legacy 32-bit LBA entries in the MBR partition table, the recorded size of this partition is clipped at the maximum, thereby ignoring the rest of the disk. This amounts to a maximum reported size of 2 TiB, assuming a disk with 512 bytes per sector (see 512e).