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2. Apple Disk Image - Wikipedia

   en.wikipedia.org/wiki/Apple_Disk_Image

   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. An Apple disk image file's name usually has ".dmg" as its extension. A disk image is a compressed copy of the contents of a disk or folder. Disk images have .dmg at the end of their ...

3. macOS - Wikipedia

   en.wikipedia.org/wiki/MacOS

   macOS, originally Mac OS X, previously shortened as OS X, is an operating system developed and marketed by Apple since 2001. It is the primary operating system for Apple's Mac computers. Within the market of desktop and laptop computers, it is the second most widely used desktop OS, after Microsoft Windows and ahead of all Linux distributions, including ChromeOS .

4. HFS Plus - Wikipedia

   en.wikipedia.org/wiki/HFS_Plus

   HFS Plus or HFS+ (also known as Mac OS Extended or HFS Extended) is a journaling file system developed by Apple Inc. It replaced the Hierarchical File System (HFS) as the primary file system of Apple computers with the 1998 release of Mac OS 8.1. HFS+ continued as the primary Mac OS X file system until it was itself replaced with the Apple File ...

5. Mac operating systems - Wikipedia

   en.wikipedia.org/wiki/Mac_operating_systems

   The current Mac operating system is macOS, originally named "Mac OS X" until 2012 and then "OS X" until 2016. [3] It was developed between 1997 and 2001 after Apple's purchase of NeXT. It brought an entirely new architecture based on NeXTSTEP, a Unix system, that eliminated many of the technical challenges that the classic Mac OS faced, such as ...

6. Gatekeeper (macOS) - Wikipedia

   en.wikipedia.org/wiki/Gatekeeper_(macOS)

   Gatekeeper is a security feature of the macOS operating system by Apple. [1] [2] It enforces code signing and verifies downloaded applications before allowing them to run, thereby reducing the likelihood of inadvertently executing malware. Gatekeeper builds upon File Quarantine, which was introduced in Mac OS X Leopard (10.5) and expanded in Mac OS X Snow Leopard (10.6). [3] [4] The feature ...

7. OS X El Capitan - Wikipedia

   en.wikipedia.org/wiki/OS_X_El_Capitan

   OS X El Capitan ( / ɛl ˌkæpɪˈtɑːn / el KAP-i-TAHN) ( version 10.11) is the twelfth major release of macOS (named OS X at the time of El Capitan's release), Apple Inc. 's desktop and server operating system for Macintosh. It focuses mainly on performance, stability, and security. [3] Following the California location-based naming scheme introduced with OS X Mavericks, El Capitan was ...