PC DOS is an OEM version of MS DOS MS DOS was originally based on SCPs 86 DOS

Pc dos is an oem version of ms dos ms dos was

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(PC DOS is an OEM version of MS-DOS, MS-DOS was originally based on SCP's 86- DOS. DR-DOS was based on Digital Research's Concurrent DOS.) The FAT file systems
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are therefore well-suited as a universal exchange format between computers and devices of most any type and age. The FAT file system traces its roots back to an (incompatible) 8-bit FAT precursor in Stand-alone Disk BASIC and the short-lived M-DOS project. Over the years, the file system has been expanded from FAT12 to FAT16 and FAT32. Various features have been added to the file system including subdirectories, codepage support, extended attributes, and long filenames. Third-parties such as Digital Research have incorporated optional support for deletion tracking, and volume/directory/file-based multi-user security schemes to support file and directory passwords and permissions such as read/write/execute/delete access rights. Most of these extensions are not supported by Windows. The FAT12 and FAT16 file systems had a limit on the number of entries in the root directory of the file system and had restrictions on the maximum size of FAT-formatted disks or partitions. FAT32 addresses the limitations in FAT12 and FAT16, except for the file size limit of close to 4 GB, but it remains limited compared to NTFS. FAT12, FAT16 and FAT32 also have a limit of eight characters for the file name, and three characters for the extension (such as .exe). This is commonly referred to as the 8.3 filename limit. VFAT, an optional extension to FAT12, FAT16 and FAT32, introduced in Windows 95 and Windows NT 3.5, allowed long file names (LFN) to be stored in the FAT file system in a backwards compatible fashion. NTFS NTFS, introduced with the Windows NT operating system, allowed ACL-based permission control. Other features also supported by NTFS include hard links, multiple file streams, attribute indexing, quota tracking, sparse files, encryption, compression, and reparse points (directories working as mount-points for other file systems, symlinks, junctions, remote storage links), though not all these features are well-documented. [ citation needed ] exFAT exFAT is a proprietary and patent-protected file system with certain advantages over NTFS with regards to file system overhead. exFAT is not backwards compatible with FAT file systems such as FAT12, FAT16 or FAT32. The file system is supported with newer Windows systems, such as Windows 2003, Windows Vista, Windows 2008, Windows 7 and more recently, support has been added for Windows XP. [8] Support in other operating systems is sparse since Microsoft
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has not published the specifications of the file system and implementing support for exFAT requires a license. OpenVMS MVS [IBM Mainframe] Other file systems The Prospero File System is a file system based on the Virtual System Model. [9] The system was created by Dr. B. Clifford Neuman of the Information Sciences Institute at the University of Southern California.
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