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README.1ST
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1994-03-05
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HPFSDFRG.EXE - Defragment files on an OS/2 HPFS drive.
Author: Jack Grey: Compuserve [76040,342], jackgrey@iglou.com
Written: December 1993.
Compiled February 1994 with the GNU C Compiler version 2.5.8 for EMX 0.8H
with EMX libraries at patch level 5. The EMX .DLL files are not required.
----------------------------------------------------------------------------
DISCLAIMER:
-----------
In consideration of the use of this program, all USERS ACKNOWLEDGE
THAT THERE ARE NO WARRANTIES AS TO MERCHANTABILITY OR FITNESS FOR
A PARTICULAR PURPOSE AND USERS ACCEPT THE RESPONSIBILITY TO TAKE
SUCH STEPS AS THEY DEEM NECESSARY TO PROTECT THEIR SYSTEMS AND DATA.
THE AUTHOR CANNOT BE LIABLE FOR ANY LOSSES OCCURRING AS A RESULT OF
THE USE OF THIS PROGRAM.
YOU USE THIS PROGRAM ENTIRELY AT YOUR OWN RISK.
----------------------------------------------------------------------------
Usage: hpfsdfrg <directory name with terminating slash> [-s]
-s parm will do all directories below as well
Examples:
Dir \temp1\ only: hpfsdfrg \temp1\
Dir \temp1\ and its subdirectories: hpfsdfrg \temp1\ -s
Entire current drive: hpfsdfrg \ -s
----------------------------------------------------------------------------
IMPORTANT USAGE INSTRUCTIONS! READ PRIOR TO USING HPFSDFRG!
-----------------------------------------------------------
As with any utility that makes major changes to files, it is recommended that
DATA BE BACKED UP PRIOR TO THE USE OF HPFSDFRG.
This program is to be used only when files are not opened or locked by system
processes. As such, in order to fully defragment a partition, it is recommended
that the system be booted from another partition or floppy disk and the program
itself be loaded from a source other than the target drive. If an open or locked
file is encountered, the program will terminate.
The program has been tested under OS/2 2.1 GA and OS/2 2.11 with both HPFS.IFS
and HPFS386.IFS on 80386 and 80486 systems with HPFS partitions as large as
2 gigabytes.
However, IT HAS NOT been tested on IBM Lan Server/Microsoft Lan Manager drives
containing ACL information. As such, please proceed with caution in these
environments. The author would be interested in feedback regarding the use of
hpfsdfrg in these environments.
The program sets write verify on during execution. It is recommended that a
minimum-sized HPFS cache be allocated and that the Lazy Write option be set to
OFF ( CACHE /LAZY:OFF or CACHE386 /LAZY:OFF ) prior to running hpfsdfrg.
Files flagged System, Hidden, or ReadOnly are not processed.
There must be free space available on the drive greater than the size of
the largest file processed by hpfsdfrg.
Finally, DO NOT INTERRUPT THE PROGRAM BY PRESSING CTRL-BREAK OR CTRL-C!
DOING SO MAY RESULT IN CORRUPTION OF THE FILE BEING PROCESSED AT THE TIME.
Pressing the ESCAPE key will cause the program to terminate after completing
processing of the current file.
HOW IT WORKS:
-------------
Each file processed is copied to a temporary file named '~~~~~~~~.$$$' in the
current directory. If the copy is successful, the original file is deleted and
the temporary file is renamed to the original file's name. Date stamps and
extended attributes are preserved.
The program takes advantage of the HPFS property of attempting to create a file
in a contiguous area of free space on the drive. However, a file may not be
fully defragmented if there is not a contiguous space greater than or equal to
the size of the file. In any case, a minimal number of fragments will be used.
RECOVERY:
---------
Every effort has been taken to avoid data loss. The program will terminate
if it is able to detect an error condition during execution. However, in the
event the renaming of the temporary file fails, the program will terminate
and the temporary file will remain in the directory being processed at the
time of failure. The name of the file being processed will be displayed and
the user may attempt to recover by manually renaming the temporary file to
the original file name. ONCE AGAIN, PLEASE BACK UP YOUR DATA PRIOR TO USING
HPFSDFRG.
DISTRIBUTION:
------------
The author offers this program to the public domain for distribution in
unmodified form with all files contained in the archive HPFSDFRG.ZIP. This
documentation file must be included.