Add buffers to the list of available buffers for a specific
drive. Adding buffers speeds disk access but has the drawback
of using up system memory (typically 512 bytes per buffer).
Specifying a negative number subtracts buffers from the drive.
If only the DRIVE argument is specified, the number of
buffers for that drive are displayed without changing the buffer
allocation.
Inputs
DRIVE -- the drive to alter the buffer allocation of
BUFFERS -- the number of buffers to add (or subtract in case of
a negative number) to a drive.