File system
PageSeeder relies on the file system to store documents and binary files. For information about files managed by PageSeeder, see folders and files.
Common file systems
The following table summarizes the important features and limitations of common file systems:
| Linux | Windows | MacOS | |||
|---|---|---|---|---|---|
| Ext3 | Ext4 | FAT32 | NTFS | HFS + | |
| Max volume size | 4 Tib-32 Tib | 1 EiB | 32 Gib | 16 EiB | 8 EiB |
| Max file size | 16 Gib-2 Tib | 16 Tib | 4 Gib | 16 EiB | 8 EiB |
| Max filename length | 255 bytes | 255 UTF-16 characters | |||
| Max pathname length | 4,096 bytes | 32,760 UTF-16 characters | |||
| Allowed chars in filenames | All bytes (except NUL) | Any Unicode character (except NUL and '/') | Any Unicode character (including NUL) | ||
| Directories | 31998 | unlimited | |||
| Max number of files | Depends on volume size | 4 billion | 264-1 | 232-1 | |
| Case sensitive | Yes | Yes | No | Optional - OS prevents same case-insensitive name in a directory | |
| Case preserving | Yes | Yes | Yes | Yes | Yes |
Note that additional limitations are imposed by the operating system.
Other file systems
The following file systems are used for external storage devices such as USB keys, SD cards, DVD and CD-ROM.
| UDF | exFAT | |
|---|---|---|
| Max volume size | 2 TB | 128 PiB |
| Max file size | 16 EB | 128 PiB |
| Max filename length | 255 bytes | 255 UTF-16 characters |
| Max pathname length | 1023 bytes | |
| Allowed chars in filenames | Any Unicode except NUL | Unicode UTF-16 except:
|
| Max files in directories | 2,796,202 | |
| Max number of files | ||
| Reserved file names |
Operating system limits
Operating systems impose additional limits to the file system. Most use Unicode in practice.
Linux
- Unicode support by default using UTF-8 encoding.
- File names starting with a ‘.’ are hidden.
Microsoft Windows
- Unicode using by default UTF-16 encoding.
- Reserved characters in filenames:
- U+0000 (NUL) through to U+0031.
- < (less than).
- > (greater than).
- : (colon).
- " (double quote).
- / (forward slash).
- \ (backslash).
- | (vertical bar or pipe).
- ? (question mark).
- * (asterisk).
- Reserved file names:
- CON, PRN, AUX, NUL, COM1, COM2, COM3, COM4, COM5, COM6, COM7, COM8, COM9, LPT1, LPT2, LPT3, LPT4, LPT5, LPT6, LPT7, LPT8, and LPT9.
- Use of filename even with an extension (e.g. NUL.txt) is not recommended.
- File names shouldn’t end with a ‘.’ or ‘ ’ (space).
MacOS
- Unicode using by default UTF-16 encoding.
- Reserved characters:
- : (colon).
- / (slash).