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2. 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.

3. Disk image - Wikipedia

   en.wikipedia.org/wiki/Disk_image

   A disk image is a snapshot of a storage device's structure and data typically stored in one or more computer files on another storage device. [1][2] Traditionally, disk images were bit-by-bit copies of every sector on a hard disk often created for digital forensic purposes, but it is now common to only copy allocated data to reduce storage ...

4. Data compression ratio - Wikipedia

   en.wikipedia.org/wiki/Data_compression_ratio

   Definition. Data compression ratio is defined as the ratio between the uncompressed size and compressed size: [1][2][3][4][5] Thus, a representation that compresses a file's storage size from 10 MB to 2 MB has a compression ratio of 10/2 = 5, often notated as an explicit ratio, 5:1 (read "five" to "one"), or as an implicit ratio, 5/1.

5. Apple Software Restore - Wikipedia

   en.wikipedia.org/wiki/Apple_Software_Restore

   Apple Software Restore. Apple Software Restore or asr is a command line utility in Mac OS X used to apply a DMG disk image to a selected partition or mount point on a file system. It is often used for cloning large numbers of Macintosh computers. Apple Software Restore can read an image locally or from a server via HTTP or its own multicast asr ...

6. JPEG - Wikipedia

   en.wikipedia.org/wiki/JPEG

   JPEG (/ ˈdʒeɪpɛɡ / JAY-peg, short for Joint Photographic Experts Group) [2] is a commonly used method of lossy compression for digital images, particularly for those images produced by digital photography. The degree of compression can be adjusted, allowing a selectable tradeoff between storage size and image quality.

7. JPEG File Interchange Format - Wikipedia

   en.wikipedia.org/wiki/JPEG_File_Interchange_Format

   The JPEG File Interchange Format (JFIF) is an image file format standard published as ITU-T Recommendation T.871 and ISO/IEC 10918-5. It defines supplementary specifications for the container format that contains the image data encoded with the JPEG algorithm. The base specifications for a JPEG container format are defined in Annex B of the ...