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. It bypassed MS-DOS and directly accessed the disk, either via the BIOS or 32-bit disk access. This feature was a backport from the then-unreleased Windows 95, as suggested by Microsoft's advertisements for Windows for Workgroups 3.11.
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. However, it was still possible to boot Windows 95 into a pure real-mode DOS system mode.
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 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.