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exFAT (Extensible File Allocation Table) is a file system optimized for flash memory such as USB flash drives and SD cards, that was introduced by Microsoft in 2006. [7] exFAT was proprietary until 28 August 2019, when Microsoft published its specification. [8] Microsoft owns patents on several elements of its design. [2]
Limits; Max volume size: 8 exabyte [1] Max file size: 8 EB [2] Max no. of files: 4,294,967,295 (2 32 − 1) Max filename length: 255 characters (255 UTF-16 encoding units, normalized to Apple-modified variant of Unicode Normalization Format D) Allowed filename characters: Unicode, any character, including NUL. OS APIs may limit some characters ...
Examples of operating systems that do not impose this limit include Unix-like systems, and Microsoft Windows NT, 95-98, and ME which have no three character limit on extensions for 32-bit or 64-bit applications on file systems other than pre-Windows 95 and Windows NT 3.5 versions of the FAT file system. Some filenames are given extensions ...
The limit on partition size was dictated by the 8-bit signed count of sectors per cluster, which originally had a maximum power-of-two value of 64. With the standard hard disk sector size of 512 bytes, this gives a maximum of 32 KB cluster size, thereby fixing the "definitive" limit for the FAT16 partition size at 2 GB for sector size 512.
While storage devices usually have their size expressed in powers of 10 (for instance a 1 TB Solid State Drive will contain at least 1,000,000,000,000 (10 12, 1000 4) bytes), filesystem limits are invariably powers of 2, so usually expressed with IEC prefixes.
A flash drive (also thumb drive, memory stick, and pen drive/pendrive) [1] [note 1] is a data storage device that includes flash memory with an integrated USB interface. A typical USB drive is removable, rewritable, and smaller than an optical disc , and usually weighs less than 30 g (1 oz).
HFS is also referred to as Mac OS Standard (or HFS Standard), while its successor, HFS Plus, is also called Mac OS Extended (or HFS Extended). With the introduction of Mac OS X 10.6 , Apple dropped support for formatting or writing HFS disks and images , which remained supported as read-only volumes until macOS 10.15 . [ 1 ]
A flash drive, a typical USB mass-storage device An M.2 (2242) solid-state-drive connected into USB 3.0 adapter and connected to computer. The USB mass storage device class (MSC or UMS) standardizes connections to storage devices. At first intended for magnetic and optical drives, it has been extended to support flash drives and SD card readers.