It's not really obvious from DISKBUF's documentation that it
must be run ONLY from a floppy disk in the a: drive. It doesn't
do an absolute, total reboot after each cycle; it goes straight
back to the a: drive.
If your CONFIG.SYS contains a FILES= statement of value greater
than the number you specify in DISKBUF's MINBUF parameter,
DISKBUF appears to start with BUFFERS equal to the FILES value.