rawrite version 2.0 - 04/30/92 - Write disk image files to floppy diskettes. Version 1 by Mark Becker; hacked by Guy Helmer to improve performance. I'm releasing my improvements on rawrite.c to the public for general testing. rawrite 1.2 was horribly slow on the computers I tried it on. The main loop was writing only three sectors to the disk during each iteration. Comments revealed that the original author found full-track writes didn't work on some machines; my bet for the reason for this problem is that the source buffer happened to cross a 64Kb physical memory boundary, which the PC's DMA can't handle. I've included code to check for the DMA boundary problem and changed the program to write a track full of sectors in each iteration of the main loop. The result of this modification is that version 2 should only take 1/5 or 1/6 of the time that version 1 took to write a 1.2Mb or 1.44Mb diskette. The performance increase is nice :-) I've also added the features to accept the disk image file, target diskette drive, and a "don't wait" option from the command line. If the "don't wait" option is specified, the program doesn't pause for the user to insert the diskette and press <Enter>; it assumes the diskette is ready and waiting in the target drive. Version 2 only accepts drives A and B as target drives. Please check this program - I'm not 100% postive that it will work for all PC's. If it doesn't work, try Mark's rawrite version 1.2 to see if it will work for you, and maybe drop me an email describing the problem you encountered and the type of system you were using. Guy Helmer ghelmer@dsuvax.dsu.edu
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