High Performance File System: Difference between revisions

Revision as of 07:46, 9 August 2005

Revision as of 21:21, 12 August 2005

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'''HPFS''' or '''High Performance File System''', is a [[file system]] created specifically for the [[OS/2]] [[operating system]] to improve upon the limitations of the [[File Allocation Table|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 [[International Business Machines|IBM]].

== [[Common Filesystem Features]] Table ==

{| align="centre" border="1"

|-

! Feature || HPFS

|-

! Inventor

| Microsoft

|-

! Name

| High Performance File System (codenamed Pinball)

|-

! Native Operating System

| OS/2

|-

! Partition Identificator

| [[MBR]]: 0x07

|-

! Bad sector allocation

| B+Tree

|-

! File allocation

| B+Tree

|-

! Directory structure

| B+Tree

|-

! Namespace

| Double-byte from 0x0020 to 0xFFFF

|-

! Maximum filename size

| 255 characters

|-

! Maximum files

| Unlimited

|-

! Maximum volume size

| 16Tb

|-

! Dates handled

| Creation, Access, Modified

|-

! Maximum date

| Unknown

|-

! Attributes

| Read-only, hidden, system, archive

|-

! Named streams

| Yes

|-

! Per-volume compression

| No

|-

! Per-volume encryption

| No

|-

! Per-file compression

| No

|-

! Per-file encryption

| No

|-

! Access Control Lists

| Yes (only in HPFS386)

|}

Among its improvements are