Microsoft 32-bit file access: Difference between revisions

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'''32-bit file access''' refers to the higher performance, [[protected mode]] disk caching method introduced in [[Windows for Workgroups]] 3.11, which replaced [[SmartDrive]] (Smartdrv).

[['''32-bit]] file access''' refers to the higher performance, [[protected mode]] disk caching method introduced in [[Windows for Workgroups]] 3.11, which replaced [[SmartDrive]] (Smartdrv). It bypassed [[MS-DOS]] and directly accessed the disk, either via the [[BIOS]] or (preferably) [[32-bit disk access]] (Windows-native protected mode disk drivers). This feature was a [[backport]] from the then-unreleased [[Windows 95]], as suggested by Microsoft's advertisements for Windows for Workgroups 3.11 ("the 32-bit file system from our Chicago project").

With the introduction of 32-bit file access and Long File Names in Windows 95, DOS was reduced to the role of a [[boot loader]] for Windows.{{fact|date=October 2019}} However, it was still possible to boot Windows 95 into a pure real-mode DOS system mode.

[[32-bit]] file access bypassed [[MS-DOS]] and directly accessed the disk, either via the [[BIOS]] or (preferably) [[32-bit disk access]] (Windows-native protected mode disk drivers). This feature was a [[backport]] from the then-unreleased [[Windows 95]], as suggested by Microsoft's advertisements for Windows for Workgroups 3.11 ("the 32-bit file system from our Chicago project").

32-bit file accessIt was implemented using the [[File Allocation Table#Long_File_Names_.28VFAT.2C_LFNs.29|VFAT]], VCACHE, and [[IFSHLP.SYS|IFSMgr]] [[VxD]] drivers.

32-bit file access and the introduction of Long File Names in Windows 95 reduced DOS to the role of a [[boot loader]] for Windows.

32-bitAlso, file accessit should not be confused with '''[[32-bit disk access]]'''. Although both technologies are similar, 32-bit disk access (also known as ''FastDisk'') pre-dates [[Windows for Workgroups]] 3.11. 32-bit file access provided a 32-bit code path for Windows to directly access the disk bus by intercepting the [[MS-DOS]] Int 21H services while remaining in 386 [[protected mode]] and at CPU speeds, rather than handling the Int 21H services in real mode by MS-DOS. 32-bit disk access relatively offers relatively less performance and is less likely to work on many computers than 32-bit file access. 32-bit file access does not need 32-bit disk access.

32-bit file access was implemented using the [[File Allocation Table#Long_File_Names_.28VFAT.2C_LFNs.29|VFAT]], VCACHE, and IFSMgr [[VxD]] drivers.

32-bit file access should not be confused with '''[[32-bit disk access]]'''. Although both technologies are similar, 32-bit disk access (also known as ''FastDisk'') pre-dates [[Windows for Workgroups]] 3.11. 32-bit file access provided a 32-bit code path for Windows to directly access the disk bus by intercepting the [[MS-DOS]] Int 21H services while remaining in 386 [[protected mode]] and at CPU speeds, rather than handling the Int 21H services in real mode by MS-DOS. 32-bit disk access relatively offers less performance and is less likely to work on many computers than 32-bit file access. 32-bit file access does not need 32-bit disk access.

==See also==

* [[32-bit disk access]]

* [[IFSHLP.SYS]] <!-- these articles should be joined -->

==External links==

* {{usurped|1=[https://web.archive.org/web/20071011012746/http://marina.mfarris.com/theref/files/32bfa.txt MS Windows 32-Bit File Access Meta-FAQ]}}

* [http://users.exis.net/~gewkab/32bfafaq.html 32-bit file access FAQs]

* [https://archive.today/20010210032640/http://supportusers.microsoftexis.comnet/?id=83325 Explanation of SMARTDRV &~gewkab/32bfafaq.html 32-bit diskfile access from MicrosoftFAQs]

* https://web.archive.org/web/20070324064925/http://pclt.cis.yale.edu/pclt/OPSYS/WFWG311.HTM

* [http://support.microsoft.com/kb/106275 Windows for Workgroups 3.11 FAQs]

[[Category:Microsoft Windows file system technology]]

[[Category:Windows disk file systems]]

{{windows-stub}}

[[Category:Windows disk file systemsarchitecture]]