Not to be confused with Hi Performance FileSystem.
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HPFS
Developer(s)
Microsoft, IBM
Full name
High Performance File System
Introduced
November 1989; 34 years ago (1989-11) with OS/2 1.2
Partition IDs
0x07 (MBR)
Structures
Directory contents
B tree
File allocation
B+ tree
Bad blocks
List
Limits
Max volume size
64 GB (as implemented) 2 TB (theoretical)
Max file size
2 GB
Max no. of files
Unlimited
Max filename length
255 characters
Allowed filename characters
Single-byte from 0x20 to 0xFF
Features
Dates recorded
Access, Creation, Modified
Forks
Yes
Attributes
Read-only, hidden, system, archive
File system permissions
Yes (only in HPFS386)
Transparent compression
No
Transparent encryption
No
Other
Supported operating systems
OS/2, Windows NT, Linux, DragonFly BSD, eComStation, ArcaOS
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.
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