The description below is from the book DOS the Easy Way by Everett Murdock Ph.D.
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Type: External (3.3 and later)
Syntax:
FASTOPEN d:[=n][/X]
Purpose: Keeps track of the locations of files for fast access.
Discussion
FASTOPEN locates files on a fixed disk by searching your disk`s directory
structure in a predetermined search pattern. After running FASTOPEN,
each time
you use a file or directory, the program will make a record (in memory)
of the
file`s name and location. The next time you specify that file, DOS will
look
first in the last known location. This reduces the time needed to access
files.
This command is used only on fixed disks and can be used on up to four
fixed
disks at one time. For each fixed disk, you enter the number of files
you want
to keep track of (from 10 to 999 files). If you do not enter a number,
DOS will
keep track of 10 files. FASTOPEN uses about 40 bytes of memory for each
file or
directory location it keeps track of.
You can use this command to set the number of files to track only once.
If you
want to change the FASTOPEN settings, restart your computer.
Option
/X - Uses expanded memory for FASTOPEN buffer space.
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