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-
- RAWDISK
- =========
-
- Overview
-
- Rawdisk is a program which enables you to write to the raw media of
- a floppy disk (or a series of floppies if need be). It makes most
- sence to put rawdisk at the start or end of a command pipeline.
-
- Licence & Warranty Information
-
- This program is free software; you can redistribute it and/or modify
- it under the terms of the GNU General Public License as published by
- the Free Software Foundation; either version 1, or (at your option)
- any later version.
-
- This program is distributed in the hope that it will be useful,
- but WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- GNU General Public License for more details.
-
- You should have received a copy of the GNU General Public License
- along with this program; if not, write to the Free Software
- Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
-
- Installation Instructions
-
- Rawdisk needs to be able to open the /dev/rfd?a devices to read and
- write to raw floppies. You can do this by either installing it
- as setuid root or set-gid operator and modifying the /dev/rfd?a devices
- to be writable (as well as readable which they should be already) by
- operator. Being of a nervous disposition, I did the latter, something
- like:
- su
- mkdirs /usr/local/bin
- mv rawdisk /usr/local/bin
- chown root.operator /usr/local/bin/rawdisk
- chmod g+s /usr/local/bin/rawdisk
- chmod g+w /dev/rfd?a
- exit
- rehash
-
- Using rawdisk
-
- Rawdisk spews directly to the raw media, hence its name. Doing this
- *destroys any filesystem on the disk* SO BEWARE. Do not try
- to put the disk in before running the program, when rawdisk wants
- a disk, it will ask for it. If outside of rawdisk you insert a disk with
- raw data on it, auto-mounter will think it's a damaged disk and offer
- to repair it. If there is already a disk in the drive when rawdisk runs
- it will be ejected (but not unmounted!).
-
- When spewing to multiple disks it writes *NO* markers for first, second,
- third disk etc. THIS IS UPTO YOU! Thus when reading disks, giving the
- disks out of sequence will happily shuffle your data in disk sized chunks.
-
- Rawdisk does not write end of file markers. When reading disks, it will
- read until it is killed or its output pipe is broken or cancel is clicked
- in the disk request dialog box. This is fine for use with programs like
- tar which know when they have reached the end.
-
- Example usage:
-
- Backing up
-
- tar cf - myfiles | compress -c | rawdisk -w # write archive
- rawdisk -w | uncompress -c | tar tvf - # verify archive
- rawdisk -w | uncompress -c | tar xvf - # read archive
-
- Copying a disk
- - this seems to work, but don't use it for something vital!
-
- rawdisk -r > disk-image
- (click CANCEL when it asks for a second disk)
- rawdisk -w < disk-image
- rm disk-image
-
- Source Code
-
- I don't usually write C, so sorry if the code is a little strange. I wrote
- a wierd sort of exception handler (I didn't know about NX_RAISE) to
- handle OS call errors and ensure that if a disk is in the drive it is
- ejected before the program terminates. It should have more comments,
- but I wrote it for me.
-
- Finally
-
- I hope you like it. It could do with a few tune-ups. If you make any
- changes or find any bugs I'd like to hear from you. If you'd like to
- help me out, but don't want to hack code, write me a man page!
-
- REMEMBER, RAWDISK MAY HAVE BUGS IN IT SO USE IT AT YOUR OWN RISK.
-
-
- Richard O'Neill
- Computing Science Dept.
- Simon Fraser University
- Burnaby BC
- V5A 1S6 CANADA
-
- oneill@cs.sfu.ca
-
-
-