High Performance File System: Difference between revisions

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{{Short description|Filesystem created for OS/2 operating system}}

{{distinguish|Hi Performance FileSystem}}

{{ref improve|date=August 2013}}

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|max_filename_size = 255 characters

|max_files_no = Unlimited

|max_volume_size = 64 [[gibibytegigabyte|GiBGB]] (as implemented)<br/>2 [[tebibyteterabyte|TiBTB]] (theoretical)

| max_file_size = 2 [[gibibytegigabyte|GiBGB]]

|filename_character_set = Single-byte from <code>0x20</code> to <code>0xFF</code>

|dates_recorded = Access, Creation, Modified

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*Root directory located at the midpoint, rather than at the beginning of the disk, for faster average access

HPFS also can keep 64 [[KibibyteKilobyte|KiBKB]] of [[Metadata (computing)|metadata]] ("[[extended attribute]]s") per file.

IBM offers two kinds of [[Installable File System|IFS]] drivers for this file system:

*The standard one with a cache limited to 2&nbsp;MiBMB

*''HPFS386'' provided with certain server versions of OS/2, or as added component for the server versions that did not come with it

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Though IBM still had rights to HPFS, its agreement with Microsoft to continue licensing the HPFS386 version was contingent upon the company paying Microsoft a licensing fee for each copy sold. This was a result of the Microsoft and IBM collaboration that gave both the right to use Windows and OS/2 technology.

Due to the Microsoft dependence, limited partition size, file size limit of 2&nbsp;GiBGB and the long disk-check times after a crash, IBM ported the [[journaling file system]], [[JFS (file system)|JFS]], to OS/2 as a substitute.

[[DOS]] and [[Linux]] support HPFS via third-party drivers. [[Windows NT]] versions 3.51 (4.0) and earlier had native support for HPFS.

== Native support under Windows ==

[[Windows 95]] and its successors [[Windows 98]] and [[Windows Me]] canhave readno andsupport writefor HPFS. only{{citation whenneeded mapped via a network share; they cannot read it from a local disk.span|date=May 2023|They listed the [[NTFS]] partitions of networked computers as "HPFS"}}, because NTFS and HPFS share the same [[Partition type|filesystem identification number]] in the partition table.

[[Windows NT 3.1]] and [[Windows NT 3.5|3.5]] have native read/write support for local disks and can even be installed onto an HPFS partition.

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| author=Ray Duncan

| journal=Microsoft Systems Journal

|date=September 1989|volume=4:5

| issue=5

| pages=1–13

}}

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| title=HPFS unter Windows NT 4.0

| author=Dieter Brors

| journal=cC't Magazin für Computertechnik (German)

| year=1997|volume=1

| pages=306

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{{Filesystem}}

{{OS/2}}

[[Category:Disk file systems]]