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• High_Performance_File_System abstract "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 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.Among its improvements are:support for mixed case file names, in different code pagessupport for long file names (255 characters as opposed to FAT's 8+3 characters)more efficient use of disk space (files are not stored using multiple-sector clusters but on a per-sector basis)an internal architecture that keeps related items close to each other on the disk volumeless fragmentation of dataextent-based space allocationseparate datestamps for last modification, last access, and creation (as opposed to FAT's last modification-only datestamp)a B+ tree structure for directoriesroot directory located at the midpoint, rather than beginning of the disk, for faster average accessHPFS also can keep 64 KiB of metadata ("extended attributes") per file.IBM offers two kind of IFS drivers for this file system:the standard one with a cache limited to 2 MiBHPFS386 provided with certain server versions of OS/2, or as added component for the server versions that did not come with itHPFS386's cache is limited by the amount of available memory in OS/2's system memory arena and was implemented in 32-bit assembly language. HPFS386 is a ring 0 driver (allowing it direct hardware access and direct interaction with the kernel) with built-in SMB networking properties that are utilizable by various server daemons, whereas HPFS is a ring 3 driver. Thus, HPFS386 is faster than HPFS and highly optimized for server applications. It is also highly tunable by experienced administrators.Though IBM still had rights to HPFS, their agreement with Microsoft to continue licensing the HPFS386 version is contingent upon them paying Microsoft a licensing fee for each copy sold. This was a result from the Microsoft and IBM collaboration that both IBM and Microsoft had right to use Windows and OS/2 technology. Microsoft used HPFS in Windows NT.Due to the Microsoft dependence, limited partition size, file size limit of 2GiB and the long disk check times after a crash, IBM ported the journaling file system JFS to OS/2 as a substitute.DOS and Linux support HPFS via third-party drivers. Windows NT versions 3.51 and earlier had native support for HPFS.".
• High_Performance_File_System wikiPageExternalLink English.
• High_Performance_File_System wikiPageExternalLink hpfs.html.
• High_Performance_File_System wikiPageExternalLink 306.
• High_Performance_File_System wikiPageExternalLink HPFS.
• High_Performance_File_System wikiPageExternalLink appg.htm.
• High_Performance_File_System wikiPageID "81598".
• High_Performance_File_System wikiPageRevisionID "605277154".
• High_Performance_File_System attributes "Read-only, hidden, system, archive, sandwich".
• High_Performance_File_System badBlocksStruct B+_tree.
• High_Performance_File_System compression "No".
• High_Performance_File_System datesRecorded "Access, Creation, Modified".
• High_Performance_File_System developer Microsoft.
• High_Performance_File_System directoryStruct B+_tree.
• High_Performance_File_System encryption "No".
• High_Performance_File_System fileStruct B+_tree.
• High_Performance_File_System fileSystemPermissions "Yes".
• High_Performance_File_System filenameCharacterSet "Double-byte from 0x0020 to 0xFFFF".
• High_Performance_File_System forksStreams "Yes".
• High_Performance_File_System fullName "High Performance File System".
• High_Performance_File_System hasPhotoCollection High_Performance_File_System.
• High_Performance_File_System introductionDate "November 1989".
• High_Performance_File_System introductionOs "OS/2 1.2".
• High_Performance_File_System maxFileSize "768".
• High_Performance_File_System maxFilenameSize "255".
• High_Performance_File_System maxFilesNo "Unlimited".
• High_Performance_File_System maxVolumeSize "2".
• High_Performance_File_System maxVolumeSize "64".
• High_Performance_File_System name "HPFS".
• High_Performance_File_System os "OS/2, Windows NT, Linux, FreeBSD".
• High_Performance_File_System partitionId "0".
• High_Performance_File_System subject Category:Computer_file_systems.
• High_Performance_File_System subject Category:Disk_file_systems.
• High_Performance_File_System subject Category:Linux_kernel-supported_file_systems.
• High_Performance_File_System subject 2.
• High_Performance_File_System subject Category:Software_written_in_assembly_language.
• High_Performance_File_System subject Category:Windows_disk_file_systems.
• High_Performance_File_System type Abstraction100002137.
• High_Performance_File_System type Arrangement105726596.
• High_Performance_File_System type ClassificationSystem105727220.
• High_Performance_File_System type Cognition100023271.
• High_Performance_File_System type ComputerFileSystems.
• High_Performance_File_System type DiskFileSystems.
• High_Performance_File_System type FileSystem105732614.
• High_Performance_File_System type PsychologicalFeature100023100.
• High_Performance_File_System type Structure105726345.
• High_Performance_File_System type WindowsDiskFileSystems.
• High_Performance_File_System comment "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 FAT file system.".
• High_Performance_File_System label "HPFS".
• High_Performance_File_System label "HPFS".
• High_Performance_File_System label "HPFS".
• High_Performance_File_System label "HPFS".
• High_Performance_File_System label "HPFS".
• High_Performance_File_System label "HPFS".
• High_Performance_File_System label "HPFS".
• High_Performance_File_System label "High Performance File System".
• High_Performance_File_System label "High Performance File System".
• High_Performance_File_System label "High Performance File System".
• High_Performance_File_System sameAs High_Performance_File_System.
• High_Performance_File_System sameAs HPFS.
• High_Performance_File_System sameAs HPFS.
• High_Performance_File_System sameAs High_Performance_File_System.
• High_Performance_File_System sameAs HPFS.
• High_Performance_File_System sameAs HPFS.
• High_Performance_File_System sameAs HPFS.
• High_Performance_File_System sameAs High_Performance_File_System.
• High_Performance_File_System sameAs HPFS.
• High_Performance_File_System sameAs HPFS.
• High_Performance_File_System sameAs m.0k_q0.
• High_Performance_File_System sameAs Q127319.
• High_Performance_File_System sameAs Q127319.
• High_Performance_File_System sameAs High_Performance_File_System.
• High_Performance_File_System wasDerivedFrom High_Performance_File_System?oldid=605277154.
• High_Performance_File_System isPrimaryTopicOf High_Performance_File_System.