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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 ...
HPFS (High Performance File System) is a file system created specifically for the OS/2 operating system to improve upon the limitations of the FAT file system. It was written by Gordon Letwin and others at Microsoft and added to OS/2 version 1.2 , at that time still a joint undertaking of Microsoft and IBM , and released in 1988.
Oddly, one of the few places this "upsizing" did not take place was the file directory itself, which limits HFS to a total of 65,535 files on each logical disk. While HFS is a proprietary file system format, it is well-documented; there are usually solutions available to access HFS-formatted disks from most modern operating systems.
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. For instance, a 1 TiB limit means 2 40, 1024 4 bytes. Approximations (rounding down ...
In order to overcome the volume size limit of FAT16, while at the same time allowing DOS real-mode code to handle the format, Microsoft designed a new version of the file system, FAT32, which supported an increased number of possible clusters, but could reuse most of the existing code, so that the conventional memory footprint was increased by ...
The change to 64-bit file sizes frequently required incompatible changes to file system layout, which meant that large-file support sometimes necessitated a file system change. For example, the FAT32 file system does not support files larger than 4 GiB−1 (with older applications even only 2 GiB−1); the variant FAT32+ does support larger ...
A FAT12 and FAT16 (and FAT32) extension to support database-like file types random file, direct file, keyed file and sequential file in Digital Research FlexOS, IBM 4680 OS and Toshiba 4690 OS. [18] The record size is stored on a file-by-file basis in special entries in the directory table. [19]
The maximum file size of 4 GB on FAT32 can be easily expanded to 256 GB utilizing the open FAT32+ proposal. Therefore, for volumes smaller than 2 TB and files smaller than 256 GB, people would not have to switch to exFAT for technical reasons, whereas Microsoft (who owns and sells exFAT) documents the switch-over point at 32 GB and 4 GB ...