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32-bit File Access

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Title: 32-bit File Access  
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Subject: Windows 95, 32-bit disk access, Windows 3.1x, INT 13H, File Allocation Table
Collection: Windows Architecture
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32-bit File Access

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.

It was implemented using the VFAT, VCACHE, and IFSMgr VxD drivers.

Also, it 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, rather than handling the Int 21H services in real mode by MS-DOS. 32-bit disk access 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.

See also

External links

  • MS Windows 32-Bit File Access Meta-FAQ
  • 32-bit file access FAQs
  • Explanation of SMARTDRV & 32-bit disk access from Microsoft
  • Windows for Workgroups 3.11 FAQs

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