<s>
SmartDrive	B-Application
(	O
or	O
SMARTDRV	B-Application
)	O
is	O
a	O
disk	B-General_Concept
caching	I-General_Concept
program	O
shipped	O
with	O
MS-DOS	B-Application
versions	O
4.01	O
through	O
6.22	O
and	O
Windows	B-Application
3.0	I-Application
through	O
Windows	B-Application
3.11	O
.	O
</s>
<s>
It	O
improves	O
data	O
transfer	O
rates	O
by	O
storing	O
frequently	O
accessed	O
data	O
in	O
random-access	B-Architecture
memory	I-Architecture
(	O
RAM	B-Architecture
)	O
.	O
</s>
<s>
Early	O
versions	O
of	O
SmartDrive	B-Application
were	O
loaded	O
through	O
a	O
device	B-Application
driver	I-Application
named	O
.	O
</s>
<s>
Versions	O
4.0	O
and	O
later	O
were	O
loaded	O
through	O
an	O
executable	B-Application
file	I-Application
named	O
,	O
which	O
could	O
be	O
run	O
at	O
user	O
's	O
discretion	O
or	O
at	O
boot	O
time	O
via	O
.	O
</s>
<s>
Version	O
4.0	O
also	O
introduced	O
32-bit	O
disk	O
access	O
and	O
could	O
reduce	O
its	O
footprint	O
in	O
conventional	B-Device
memory	I-Device
(	O
the	O
first	O
640	O
kilobytes	O
of	O
memory	O
which	O
was	O
critical	O
to	O
DOS	B-Device
)	O
by	O
running	O
in	O
upper	B-Device
memory	I-Device
area	I-Device
(	O
the	O
384	O
kilobytes	O
of	O
memory	O
located	O
beyond	O
the	O
conventional	B-Device
memory	I-Device
)	O
.	O
</s>
<s>
A	O
cloaked	O
variant	O
of	O
SmartDrive	B-Application
utilizing	O
the	O
Helix	O
Cloaking	O
API	B-Application
was	O
available	O
from	O
Helix	O
Software	O
.	O
</s>
<s>
On	O
Intel	B-General_Concept
80386	I-General_Concept
processors	O
,	O
it	O
could	O
run	O
in	O
protected	B-Application
mode	I-Application
to	O
reduce	O
its	O
footprint	O
in	O
conventional	B-Device
memory	I-Device
.	O
</s>
<s>
Microsoft	O
suggests	O
SmartDrive	B-Application
to	O
be	O
used	O
when	O
installing	O
Windows	B-Application
2000	I-Application
or	O
Windows	B-Application
XP	I-Application
from	O
MS-DOS	B-Application
to	O
reduce	O
installation	O
time	O
.	O
</s>
<s>
SmartDrive	B-Application
has	O
been	O
superseded	O
by	O
VCache	O
,	O
which	O
was	O
introduced	O
in	O
Windows	B-Application
for	O
Workgroups	O
3.11	O
and	O
carried	O
over	O
to	O
Windows	B-Application
95	I-Application
,	O
Windows	B-Application
98/Windows	O
98	O
SE	O
and	O
Windows	B-Device
Me	I-Device
.	O
</s>
<s>
The	O
main	O
advantage	O
of	O
VCache	O
over	O
SmartDrive	B-Application
is	O
its	O
ability	O
to	O
adjust	O
cache	O
size	O
dynamically	O
.	O
</s>
<s>
However	O
,	O
it	O
tended	O
to	O
take	O
too	O
much	O
RAM	B-Architecture
in	O
Windows	B-Application
95	I-Application
;	O
this	O
aspect	O
was	O
improved	O
in	O
Windows	B-Device
98	I-Device
.	O
</s>
