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Each additional path name in this seemingly infinite set is an actual valid Windows path which refers to the same location. In practice, path names are limited by the 260-character DOS path limit (or newer 32,767 character limit), but truncation may result in incomplete or invalid path and file names.
16 TB − 64 KB (Windows 7, Windows Server 2008 R2 or earlier implementation) [5] 256 TB − 64 KB (Windows 8, Windows Server 2012 or later implementation) [7] 8 PB − 2 MB (Windows 10 version 1709, Windows Server 2019 or later implementation) [6] Max no. of files: 4,294,967,295 (2 32 −1) [5] Max filename length: 255 UTF-16 code units [8 ...
Long filename (LFN) support is Microsoft's backward-compatible extension of the 8.3 filename (short filename) naming scheme used in MS-DOS.Long filenames can be more descriptive, including longer filename extensions such as .jpeg, .tiff, and .html that are common on other operating systems, rather than specialized shortened names such as .jpg, .tif, or .htm.
However, "client" versions of 32-bit Windows (Windows XP SP2 and later, Windows Vista, Windows 7) limit physical address space to the first 4 GB for driver compatibility [16] even though these versions do run in PAE mode if NX support is enabled. Windows 8 and later releases will only run on processors which support PAE, in addition to NX and SSE2.
Windows NTVDM are known to use 8.3 names. This can optionally be disabled system-wide to improve performance in situations where large numbers of similarly named files exist in the same folder. [1] 8.3 filename creation can be disabled system-wide and/or per-volume, and existing 8.3 filenames can be stripped using fsutil or a Registry key. [7]
Many Windows applications are limited to a MAX_PATH value of 260, but Windows file names can easily exceed this limit. [8] From Windows 10, version 1607 , MAX_PATH limitations have been removed. [ 9 ]
No limit defined [cf] 64 MiB (67.10 MB) 2 GiB (2.147 GB) ? ZFS: 1023 bytes Any Unicode except NUL No limit defined [cf] 16 EiB (18.44 EB) 281,474,976,710,656 YiB (2 128 bytes) 2 128: File system Maximum filename length Allowable characters in directory entries [cc] Maximum pathname length Maximum file size Maximum volume size [cd] Max number of ...
When accessing files with the ANSI character set, if the total path length is more than the maximum allowed 260 characters, Windows Vista automatically uses the alternate short names (which has an 8.3 limit) to shorten the total path length. In Unicode mode, this is not done as the maximum allowed length is 32,000.