Commodore PC Ms-Dos 3.2 User's Manual page 336

264 MS-DOS User's Reference
The hh option on the /h: switch specifies the maximum head
number. Its value can range from 1 to 99.
The /n switch specifies a non-removable block device.
The 55 option on the /s: switch specifies the number of sectors
per track. Its value can range from 1 to 99.
The ttt option on the /t: 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.5ys /d:02
U
U
U
Installing the
Ramdrive.sys
device driver
Ramdrive.sys
Ramdrivasys 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,
ramdrivasys locates RAM drives in low memory.
\J
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] [/e]
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.