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What (who) is 32-bit disk access - definition
32-bit disk access
32-bit Disk Access (also known as FastDisk) refers to a special disk access and caching mode available in older, MS-DOS-based Microsoft Windows operating systems. It was a set of protected mode device drivers that worked together to take advantage of advanced disk I/O features in the system BIOS.
32-bit application
COMPUTER ARCHITECTURE BIT WIDTH
32-bit application; 32 bit application; 32 bit; 32bit; 32-Bit Machine Computer; Computer, 32-Bit Machine; 32-bit computer; 32-Bit; 32-bit processing; 32-bit version; 32-bit processor; 32-bit CPU; 32 bits; 32 bit microprocessors; 32-bit architecture; 32 bit microprocessor; 32-bit microprocessors; 32-bit; 32-bit microprocessor; 32-bit file format; 32-bit integer
<architecture, operating system> IBM PC software that runs
in a 32-bit flat address space.
The term 32-bit application came about because MS-DOS and
Microsoft Windows were originally written for the {Intel
8088} and 80286 microprocessors. These are 16 bit
microprocessors with a segmented address space. Programs
with more than 64 kilobytes of code and/or data therefore had
to switch between segments quite frequently. As this
operation is quite time consuming in comparison to other
machine operations, the application's performance may suffer.
Furthermore, programming with segments is more involved than
programming in a flat address space, giving rise to some
complications in programming languages like "memory models"
in C and C++.
The shift from 16-bit software to 32-bit software on IBM PC
clones became possible with the introduction of the {Intel
80386} microprocessor. This microprocessor and its successors
support a segmented address space with 16-bit and 32 bit
segments (more precisely: segments with 16- or 32-bit address
offset) or a linear 32-bit address space. For compatibility
reasons, however, much of the software is nevertheless written
in 16-bit models.
Operating systems like Microsoft Windows or OS/2 provide
the possibility to run 16-bit (segmented) programs as well as
32-bit programs. The former possibility exists for {backward
compatibility} and the latter is usually meant to be used for
new software development.
See also Win32s.
(1995-12-11)
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).
