PARTCOPY.EXE version 2.0 by John S. Fine <johnfine@erols.com>

   This program copies contiguous ranges of raw data between files and/or
disks.

   Use this program entirely at your own risk.  I make no claim that
this program is suitable or safe for any purpose.

ZER0-PRICE SHAREWARE:

   If you continue to use this program after a reasonable initial test,
you must register it.  You do not need to send any money.  Registration
consists entirely of sending an EMAIL to johnfine@erols.com to tell me
that you are using it, and where you got your copy.  Bug reports and
suggestions are also welcome, though I can't promise to do anything
with them.

PURPOSE of PARTCOPY:

   The name "PARTCOPY" stands for "Partial Copy".  I wrote the first version of
this program LONG ago when I needed to extract an OBJ module from a LIB file
and the librarian program wasn't completely compatible with the file's format.
It could tell me where in the .LIB the module I wanted was located, but it
crashed when it tried to extract it.  I thought I really ought to have a
simple utility for copying a chunk out of any file to any other file, so I
wrote it.

   Over the years, I ocassionally needed to copy raw data in some other way
that wasn't handled by standard utilities.  I added each of those to PARTCOPY
as I needed them.  (MOST of them are documented for this release).

   Now I use it while repairing corrupted partitions (or salvaging data from
really corrupted partitions), writing my own multi-boot code out to master
boot records and fixing PCMCIA SRAM cards that won't format properly.

WARNING:

   Please use PARTCOPY very carefully.  If you tell it to write something to
a specified location on your hard drive, that is what it will do.  It doesn't
care whether the thing you told it to write belongs there or whether it will
trash all your partitions and make all your data inaccessable.

   Before you do anything else with PARTCOPY, you really should use it to
back up the first few tracks of your hard drive onto a floppy.  Then, if you
destroy those tracks with PARTCOPY (or some other way), you can get them
back.

1)  Make a bootable diskette.

2)  Put onto that diskette whatever you consider to be the key utilities to
have when your hard drive is sick.  I would include SYS.COM as a minimum.  For
my own use, I always include FDISK and a good disk editor as well.

3)  Put PARTCOPY.EXE and this documentation onto the diskette as well.

4)  While booted on the diskette, use PARTCOPY to backup the beginning of the
hard drive onto a file on the floppy.  If you have room, backing up a half
megabyte is a good idea.  Use a command like:

   partcopy -h0 0 80000 A:disk_0.bak

5)  Put it away in a safe place.

Note, if you need to restore from that backup, reread all these instructions
first.  Try to understand what went wrong as much as possible before you try
to fix it.  Unless the backup was very recent, don't restore the full half
megabyte that you backed up.  In almost all cases, that is too much and
would corrupt your directory structure if you have added or removed files
since the backup.  Try to figure out what was clobbered and just restore
that.  For example if you just clobbered the first sector, restore it with:

   partcopy A:disk_0.bak 0 200 -h0

USAGE:

PARTCOPY source source_offset length destination {destination_offset}

   Only destination_offset is optional.  The other parameters are always
required.  The offsets and length are always in HEX.

   If the destination is a file and the destination_offset is omitted then
the file is deleted if it exists and a new file is created.  For non-file
destinations, an omitted destination_offset simply defaults to zero.

   The following rules are used to specify the source and destination:

   Any name which does not begin with a "-" is a filename and will be accessed
using MS-DOS int 21 services.

   -aL Access drive letter L using int 25 and int 26 (Absolute Disk) services.
Only the "new" form (cx=0xFFFF) is used.

   -hN Accesses hard drive N using int 13 services.

   -fN Accesses floppy drive N using int 13 services.

   -iN or -iAAA:N Directly accesses IDE hard drive N on the interface at
address AAA (default = 1F0).  This access uses polling with interrupts
disabled, so secondary (and beyond) controllers can be handled without
worrying which IRQ they connect to.  In this version, the direct IDE
access is read only.