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Topic: HPFS

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	HPFS - a Whatis.com definition - see also: High Performance File System (Site not responding. Last check: 2007-11-06)
		HPFS (High Performance File System) is the file system introduced with IBM's OS/2 Version 1.2.
		HPFS uses a centrally-located root directory and B-tree lookup to speed access.
		HPFS partitions are not visible to MS-DOS, so if you need to boot from a floppy disk, it could be inconvenient.
	searchwin2000.techtarget.com /sDefinition/0,,sid1_gci214551,00.html (243 words)

	HPFS
		HPFS not only serves as a way to organize data on random access block storage devices, but is also a software module that translates file-oriented requests from applications programs to device drivers.
		The architect of the HPFS started with a clean sheet of paper and designed a file system that can take full advantage of a multitasking environment, and that will be able to cope with any sort of disk device likely to arrive on microcomputers during the next decade.
		HPFS uses a new method to represent the location of files that are too large or too fragmented for the Fnode and consist of more than eight runs.
	www.cs.wisc.edu /~bolo/shipyard/hpfs.html (6132 words)

	HPFS (Site not responding. Last check: 2007-11-06)
		HPFS maintains a 512 byte allocation unit no matter how large the volume gets to be.
		The HPFS directory allows file names to be long, to have multiple periods, and to have lowercase letters.
		HPFS keeps information in a disk cache area of memory until it needs to be written to disk.
	www.yale.edu /pclt/BOOT/HPFS.htm (418 words)

	[No title]
		HPFS Volume Structure HPFS volumes are a new partition type-type 7-and can exist on a fixed disk alongside of the several previously defined FAT partition types.
		The HPFS designers also had to consider the inevitable damage to be wreaked by power failures, program crashes, malicious viruses and Trojan horses, and those users who tum off the machine without selecting Shutdown in the Presentation Manager Shell.
		Summary The HPFS solves all of the historical problems of the FAT file system.It achieves excellent throughput even in extreme cases-many very small files or a few very large files-by means of advanced data structures and techniques such as intelligent caching, read-ahead, and write-behind.
	www.mit.edu /afs/sipb/project/os2/text/HPFS (6196 words)

	Overview of FAT, HPFS, and NTFS File Systems
		The HPFS file system was first introduced with OS/2 1.2 to allow for greater access to the larger hard drives that were then appearing on the market.
		HPFS also allows a file to be composed of "data" and special attributes to allow for increased flexibility in terms of supporting other naming conventions and security.
		HPFS organizes a drive into a series of 8 MB bands, and whenever possible a file is contained within one of these bands.
	support.microsoft.com /support/kb/articles/q100/1/08.asp (2425 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		HPFS was first introduced to OS/2 Version 1.2, and is an example of the kind of advanced function that has not yet been implemented in less sophisticated systems like DOS.
		HPFS is particularly good for managing large disks, partitions, and large files.
		The HPFS driver passes physical addresses for data pointers, in the appropriate request format, to the device driver.
	www.os2bbs.com /file_c/tips/osdihpft.txt (1190 words)

	EDM/2 - Inside the High Performance File System - Part 1
		HPFS is not visible if you use either Dual Boot or Boot Manager to boot directly to DOS, but there are a number of shareware programs around to allow read-access to HPFS drives from DOS.
		HPFS has a maximum possible partition size of about 2,200 GB (2^21 sectors) but is restricted in the current implementation to 64 GB.
		HPFS stores directory files in a balanced multi-branch tree structure (B-tree) which is always sorted due to the way the branches are assigned.
	www.edm2.com /0411/hpfs1.html (5876 words)

	apcmag.com: OS/2 Warp: April 2000 (Site not responding. Last check: 2007-11-06)
		HPFS was built, from the ground up, with the speed and stability of large hard disks in mind." (Read the full transcript at http://www.os2ezine.com/v1n2/hpfs-fat.html.)
		With HPFS, newly created files are scattered across the disk in separate bands, so that those sectors are allocated to the files as they are extended, making it harder for files to interleave.
		HPFS also pre-allocates about 4K of contiguous space to a file each time it is opened, in case it needs to be extended, and gives back any excess when the file is closed.
	www.apcmag.com /apc/v3.nsf/0/6F3A3DF27B77510BCA256D44001FF9EC (761 words)

	File Systems (FAT, HPFS, NTFS)
		HPFS is used by OS/2 and is supported by Windows NT.
		They put an HPFS or NTFS file system on the first Primary Partition, and a FAT file system on the second.
		HPFS is supported by OS/2 and Windows NT.
	pclt.cis.yale.edu /pclt/BOOT/IFS.HTM (1084 words)

	Cut FAT out of your computing diet: Check out the OS/2 High Performance File System
		Technically, HPFS is an abstract layer of functions that listen to OS/2 for file-management requests, passing them to and from the hard-disk(s) onboard (and sometimes network cards) via their device drivers.
		HPFS uses a different arrangement, designed to minimize the number of times a disk needs to be searched (and thus get data to you faster).
		HPFS grabs a little extra, even more if the program requesting the space knows how to ask, and "over-grows" a file temporarily until it is closed.
	www.bss.ab.ca /os2/hpfs.htm (4284 words)

	Full documentation for HPFSRem (Site not responding. Last check: 2007-11-06)
		HPFSRem -- HPFS removability software Version 1.11 Documentation update (96/10/13) Copyright (c) 1996 by Jeff Jackowski This software is free Introduction HPFSRem allows you to use HPFS on some removable drives without losing the ability to remove and replace disks.
		Although HPFS without any special software can sometimes be used on a removable drive without any problems, I found that often system crashes will be the result and data can be lost.
		HPFS was not made to support removable drives.
	home.hiwaay.net /~jeffj1/computers/os2/hpfsrem/FullDocumentation.html (2513 words)

	Gordon Letwin Comments on HPFS Fragmentation (Site not responding. Last check: 2007-11-06)
		I suspect that the major role for the tool is to make people feel comfortable and in control and as if they're "tuning" their system; its actual bottom line contribution to performance probably isn't that important.
		HPFS can store up to 8 extents in the file's FNODE; this table is kept resident when the file is open.
		Should more than 8 extents be necessary HPFS will allocate a B+TREE to keep track of an unlimited number of extents (during development we tested with 10s of thousands of extents).
	www.lesbell.com.au /hpfsfrag.html (1142 words)

	High Performance File System (HPFS)
		The FAT file system was restricted in terms of the size of partitions it could support, only allowed 11-character names, and it had none of the organization, security and reliability features that are so important to corporate, business and individual "power" users.
		Support for HPFS volumes can be added to some non-OS/2 operating systems by using third-party support software, but overall this file system seems to be firmly in a "niche status".
		You can find more information about HPFS by reading this HPFS FAQ, which isn't "official" but seems to be well-written and fairly detailed.
	www.pcguide.com /ref/hdd/file/fileHPFS-c.html (447 words)

	The HPFS FAQ (Site not responding. Last check: 2007-11-06)
		HPFS does a pretty good job of keeping files from getting fragmented, and because of its design, it's not really a big deal if some files are fragmented.
		HPFS, by contrast, always allocates sectors, with approximately half a sector of slack space per file in all cases, so that there is no need to partition large drives (at least, for storage efficiency reasons).
		On HPFS, the maximum file size is also 2 GB, due to the 32-bit argument passed to the DosChgFilePtr() API, which is the OS/2 equivalent to lseek().
	www.lesbell.com.au /hpfsfaq.html (4306 words)

	Warp tuning - HPFS386
		HPFS as shipped with Warp allows you no more than 2Mb cache size.
		Do not REM the existing HPFS line yet, as it is your safety net: should HPFS386 fail to install, HPFS will start as before and allow you to access your disk those boot floppies you keep close by at all times.
		HPFS386 is a ring 0 driver with built-in SMB networking properties, whereas HPFS is a ring 3 driver.
	www.xs4all.nl /~mdemooij/zelf/hpfs386.html (587 words)

	HPFS
		Short for High-Performance File System, HPFS is a file system first introduced with IBM OS/2 1.2.
		HPFS is available on OS/2 1.2 and above as well as with Microsoft Windows NT 3.0.
		HPFS is not commonly found or used with today's computers and servers.
	www.computerhope.com /jargon/h/hpfs.htm (92 words)

	Felgall Operating Systems - NT/2000 - How to install HPFS support
		HPFS is the file system used by OS/2 (and which unlike NTFS can also be accessed by Linux and [with appropriate drivers] read by DOS and Windows 95-ME).
		In fact, support for HPFS was not completely removed from NT 4.0, only the driver that supplies HPFS support and the install process for that driver were removed.
		It is therefore possible to add HPFS support back into Windows NT by installing the missing driver.
	www.felgall.com /ntins2.htm (405 words)

	Ghost compatibility with HPFS
		Because the boot sector of an HPFS drive contains geometry specific information (specific to the physical drive itself), cloning to a drive other than a physically identical drive will result in an inaccessible drive.
		When cloning an HPFS drive for backup purposes, always test the resulting cloned drive to ensure its integrity before altering the source drive.
		For example: If you have a 2 GB hard drive using HPFS, but the data is only 500 MB, the image file will be 2 GB in size.
	service1.symantec.com /support/ghost.nsf/docid/1999012507263525?Open&src=tranus_con_sl (285 words)

	HPFS - TheBestLinks.com - File system, Microsoft, Metadata (computing), Operating system, ...
		HPFS, short for 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.
		Because of the Microsoft dependence and the longer disk check times after crash, IBM ported the journaling file system JFS to OS/2 as a susbtitute.
		After the IBM and Microsoft split, Microsoft created NTFS as an extension of HPFS.
	www.thebestlinks.com /HPFS.html (242 words)

	iHPFS (Site not responding. Last check: 2007-11-06)
		HPFS has many advantages over the FAT system that DOS uses.
		The HPFS partition is assigned a drive letter, and can be accessed like any DOS drive.
		Data files and programs on the HPFS partition may be read and executed, or copied to other drives.
	www.student.nada.kth.se /~f96-bet/ihpfs (229 words)

	OS/2 eZine - The Best OS/2 Reading Anywhere!
		HPFS introduced a number of functional enhancements like long file names and extended attributes (while extended attributes are also handled in FAT systems, HPFS stores the extended attributes in the file structure(s) itself, i.e.
		HPFS relies on several different types of caching to minimize the number of physical disk transfers it must request.
		HPFS386 is a variant of HPFS designed to provide extremely fast access to large disk volumes and optimized performance in server environments.
	www.os2ezine.com /20020416/pf_5.html (5138 words)

	HPFS and FAT filename characters
		Configuration If all legal filename characters depending on file system (FAT vs. HPFS etc.), codepage (437 vs. 850 etc.), and even installed fixpack are documented somewhere, then please tell me where...
		Characters in a line marked by "aka" are treated as identical with the character(s) in the same column, notably the next HPFS- resp.
		Trailing dots don't work on HPFS, a leading dot may have a special meaning (*NIX), many programs treat the last dot as THE DOT, and in a FAT dots are not supported (except from the implicit 8+3 dot).
	www.xyzzy.claranet.de /filechar.htm (599 words)

	EDM/2 - Inside the High Performance File System - Part 2/6
		Since HPFS is a sophisticated file system that is designed to accomplish a lot more than FAT, it correspondingly requires more diskspace than FAT.
		With both FAT and HPFS, a 1,536 KB lazy-writing cache with a maximum cacheable read/write size of 8 KB was used.
		HPFS uses three strategies here that I'm aware of.
	www.edm2.com /0411/hpfs2.html (5876 words)

	OS/2 Warp FAQ List (20 Feb 95) Section 0105 (Site not responding. Last check: 2007-11-06)
		HPFS is an installable file system (IFS) provided with OS/2 Warp which may optionally be used instead of (or alongside) the standard DOS-style FAT (File Allocation Table) file system.
		HPFS is not case sensitive, although it does preserve case in file names.
		However, HPFS is not currently supported on removeable media, although some programs (e.g.
	www.mit.edu /activities/os2/faq/os2faq0105.html (313 words)

	Software Magazine: High performance File System - HPFS - Programmed Logic Corp.'s file management software - Brief ... (Site not responding. Last check: 2007-11-06)
		Users can power off their machines after existing applications without requiring file systems to be checked when the system is rebooted.
		HPFS currently runs on USL SVR4-based versions of Unix.
		Pricing is $249 for a single user, $499 for multi-users and $999 for the multiprocessor version.
	www.findarticles.com /p/articles/mi_m0SMG/is_n6_v13/ai_13736161 (192 words)

	Removable Media under OS/2 - Page 5 (Site not responding. Last check: 2007-11-06)
		Brandon S. Allbery writes: The answer is yes for SyQuests; I have been as unsuccessful with HPOFS as I have been with HPFS on Zip drives, and the failure mode is similar for both (writes succeed but subsequent reads return garbage) so I conclude that something (the FLT driver?) is messing with the data.
		It doesn't perform quite as well as HPFS (it was more of a technology demo, and was never tuned), and behaves in many ways more like a Unix file system than a DOS/OS2 file system.
		It is much better to format the medium with HPFS as it is known to be secure and stable.
	rheooptik.fmf.uni-freiburg.de /www/faq/hpofs.htm (500 words)

	Preparing HPFS disks without FDISK (Site not responding. Last check: 2007-11-06)
		If you cannot lock the disk, you won't be able to use HPFS on the disk.
		If this step doesn't work and you are using a SCSI controller, then you may be using and may have to use device drivers that will not allow the disk to be formatted with HPFS.
		However, HPFS does not like to have one of its disks disappear without warning.
	home.hiwaay.net /~jeffj1/computers/os2/hpfsrem/NoFDISK.html (248 words)

	[No title] (Site not responding. Last check: 2007-11-06)
		Since DOS cannot see or access HPFS drives, the problem is how to get Windows 3.1 on an HPFS drive.
		Answer Summary: This configuration is fine, but the user will not be able to put HPFS on the boot partition.
		For any drives to be formatted HPFS, the user would issue the command: FORMAT X: /fs:HPFS There X is the drive to be formatted.
	www.empowermentzone.com /win31os2.txt (1703 words)

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