1264
MS-DOS User's Reference
Installing the
Ramdrive.sys
device driver
The
hh
option
on
the
Ih: switch specifies
the
maximum
head
number. Its value
can
range from 1
to
99.
The
In
switch specifies a non-removable block device.
The
ss
option
on
the
Is:
switch
specifies
the
number
of
sectors
per
track. Its value can range from 1
to
99.
The
ttt
option
on
the
It:
switch specifies
the
number
of
tracks
per
side
on
the
block device. Its value can range from 1
to
999.
For example,
if
you
want
to
add an external 720K-byte drive
to
your
computer,
you
would
include
the
following line in
the
config.sys file:
device=driver.sys
Id:02
Ramdrive.sys
Ramdrive.sys is a device
driver
that
lets
you
use
a
portion
of
your
computer's
memory
as
if
it
were
a disk drive. This
memory
area is
called a
RAM
disk and is sometimes referred
to
as a virtual disk.
RAM
disks
are
much
faster than disk drives
because
the
informa-
tion
they
contain is always loaded
into
memory.
If
your
computer
has
extended
memory
installed (starting at
the
1 megabyte boun-
dary),
or
if
you
have an
extended
memory
board
that
meets
the
Lotus®/Intel®/Microsoft® Expanded Memory Specification, you
can
use
this
memory
for
one
or
more
RAM disks. Otherwise,
ramdrive.sys locates RAM drives in
low
memory.
Note This
command
increases
the
size
of
MS-DOS resident
in
memory.
To install
ramdrive.sys, include a
command
of
the
following form
in
your
config.sys file:
device
= ramdrive.sys
[bbbb]
[ssss]
[dddd]
[Ie]
or
device
= ramdrive.sys
[bbbb]
[ssss]
[dddd]
[/a]
The
bbbb
option
specifies
the
disk size
in
kilobytes.
The
default
size is 64K bytes;
the
minimum, 16.
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