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  2. Comparison of memory cards - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_memory_cards

    Same build as SD/SDHC, but greater capacity and transfer speed, 32 GB and higher. Standard goes up to 2 TB (not compatible with older host devices). microSDXC: 2009 2 TB [6] Same build as microSD/microSDHC, but greater capacity and transfer speed, 32 GB and higher. Standard goes up to 2 TB (not compatible with older host devices). SDUC: 2018

  3. Disk formatting - Wikipedia

    en.wikipedia.org/wiki/Disk_formatting

    A block, a contiguous number of bytes, is the minimum unit of storage that is read from and written to a disk by a disk driver.The earliest disk drives had fixed block sizes (e.g. the IBM 350 disk storage unit (of the late 1950s) block size was 100 six-bit characters) but starting with the 1301 [8] IBM marketed subsystems that featured variable block sizes: a particular track could have blocks ...

  4. HFS Plus - Wikipedia

    en.wikipedia.org/wiki/HFS_Plus

    HFS Plus or HFS+ (also known as Mac OS Extended or HFS Extended [5]) 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.

  5. SD card - Wikipedia

    en.wikipedia.org/wiki/SD_card

    Unlocked and locked SD cards Sony 64 GB SF-M Tough Series UHS-II SDXC Memory Card is one of the few cards in the market without a sliding tab on the write protect notch. Most full-size SD cards have a "mechanical write protect switch" allowing the user to advise the host computer that the user wants the device to be treated as read-only.

  6. File Allocation Table - Wikipedia

    en.wikipedia.org/wiki/File_Allocation_Table

    PC DOS 1.x file attributes included a hidden bit and system bit, with the remaining six bits undefined. At this time, DOS did not support sub-directories, but typically there were only a few dozen files on a diskette. The PC XT was the first PC with an IBM-supplied hard drive, and PC DOS 2.0 supported that hard drive with FAT12 (FAT ID 0xF8 ...

  7. Macintosh File System - Wikipedia

    en.wikipedia.org/wiki/Macintosh_File_System

    In Mac OS 7.6.1, Apple removed support for writing to MFS volumes “as such writes often resulted in errors or system hangs”, [3] and in Mac OS 8.0 support for MFS volumes was removed altogether. Although macOS (formerly Mac OS X) has no built-in support for MFS, an example VFS plug-in from Apple called MFSLives provides read-only access to ...

  8. Apple Partition Map - Wikipedia

    en.wikipedia.org/wiki/Apple_Partition_Map

    Classic Mac OS drivers partition Apple_HFS: Hierarchical File System: Apple_HFS: While normally a HFS or HFS+ volume for Mac OS and Mac OS X, it can also contain an MS-DOS formatted file system (File Allocation Table, which can be accessed by Mac OS and Mac OS X). Apple_HFSX: HFS Plus: This partition contains a HFS+ volume without a HFS wrapper.

  9. 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.