<s>
32-bit	B-Device
file	I-Device
access	I-Device
refers	O
to	O
the	O
higher	O
performance	O
,	O
protected	B-Application
mode	I-Application
disk	O
caching	O
method	O
introduced	O
in	O
Windows	O
for	O
Workgroups	O
3.11	O
,	O
which	O
replaced	O
SmartDrive	B-Application
(	O
Smartdrv	B-Application
)	O
.	O
</s>
<s>
It	O
bypassed	O
MS-DOS	B-Application
and	O
directly	O
accessed	O
the	O
disk	O
,	O
either	O
via	O
the	O
BIOS	B-Operating_System
or	O
(	O
preferably	O
)	O
32-bit	O
disk	O
access	O
(	O
Windows-native	O
protected	B-Application
mode	I-Application
disk	O
drivers	O
)	O
.	O
</s>
<s>
This	O
feature	O
was	O
a	O
backport	O
from	O
the	O
then-unreleased	O
Windows	B-Application
95	I-Application
,	O
as	O
suggested	O
by	O
Microsoft	O
's	O
advertisements	O
for	O
Windows	O
for	O
Workgroups	O
3.11	O
(	O
"	O
the	O
32-bit	O
file	O
system	O
from	O
our	O
Chicago	O
project	O
"	O
)	O
.	O
</s>
<s>
With	O
the	O
introduction	O
of	O
32-bit	B-Device
file	I-Device
access	I-Device
and	O
Long	O
File	O
Names	O
in	O
Windows	B-Application
95	I-Application
,	O
DOS	O
was	O
reduced	O
to	O
the	O
role	O
of	O
a	O
boot	B-Application
loader	I-Application
for	O
Windows	O
.	O
</s>
<s>
However	O
,	O
it	O
was	O
still	O
possible	O
to	O
boot	O
Windows	B-Application
95	I-Application
into	O
a	O
pure	O
real-mode	O
DOS	O
system	O
mode	O
.	O
</s>
<s>
It	O
was	O
implemented	O
using	O
the	O
VFAT	O
,	O
VCACHE	O
,	O
and	O
IFSMgr	B-Application
VxD	B-Application
drivers	O
.	O
</s>
<s>
32-bit	B-Device
file	I-Device
access	I-Device
provided	O
a	O
32-bit	O
code	O
path	O
for	O
Windows	O
to	O
directly	O
access	O
the	O
disk	O
bus	O
by	O
intercepting	O
the	O
MS-DOS	B-Application
Int	O
21H	O
services	O
while	O
remaining	O
in	O
386	O
protected	B-Application
mode	I-Application
,	O
rather	O
than	O
handling	O
the	O
Int	O
21H	O
services	O
in	O
real	O
mode	O
by	O
MS-DOS	B-Application
.	O
</s>
<s>
32-bit	O
disk	O
access	O
offers	O
relatively	O
less	O
performance	O
and	O
is	O
less	O
likely	O
to	O
work	O
on	O
many	O
computers	O
than	O
32-bit	B-Device
file	I-Device
access	I-Device
.	O
</s>
<s>
32-bit	B-Device
file	I-Device
access	I-Device
does	O
not	O
need	O
32-bit	O
disk	O
access	O
.	O
</s>
