Tandy 1000 MS-DOS Reference Manual page 364

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Appendix C / Installable Device Drivers
VDISK.SYS
(For the Virtual Disk)
Accessing information from floppy or hard disk is slow compared
to accessing information from your computer's memory. This is
because of the time it takes for the disk to get up to speed and
for the disk's read/write head to locate the data. Using VDISK,
you can set aside portions of your computers random access mem-
ory (RAM) that simulate disk storage. These areas are called
virtual disks.
The features of VDISK are:
When you create a virtual disk, the system automatically
assigns it a drive name. If you have only two disk drives -
floppy drives A and B - and you install a virtual disk, the
system gives the virtual disk the name C.
You can assign volume labels to virtual disks.
You can select the amount of memory for each virtual disk
to use.
Warning: If you turn off or reset the computer, you
lose the contents of virtual disks. Copy the data to
floppy or hard disk before turning off or resetting your
computer.
To install the virtual disk driver, include a DEVICE command
in your CONFIG.8YS file, using this format:
DEVICE
=
VDISK.SYS [storage sector-size dir]
storage specifies the size (in kilobytes) for the virtual disk. stor-
age
can be in the range of 1 to the capacity of your computer's
memory. The default value is 64K.
If the installation of VDISK leaves fewer than 64 kilobytes free,
VDISK reduces the amount of storage it sets aside.
sector-size is the sector size (in bytes) of the virtual disk's for-
mat. You can select 15, 256, or 512 bytes. If you omit sector-size,
or if the size you specify is not valid, VDISK sets the size to 128.
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