Low-Level Read/Write

[robherc]

Hello All-<br>
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;does anyone have any good ideas for low-level reading/writing to IDE devices? I'm wanting to create a program to low-level copy a CD-ROM in one drive to a CD-R in the other drive. Both drives are IDEs; please let me know if you have any ideas on how to do this. (I plan to use a <i>large</i> RAM buffer <p>-Robherc<br><a href=mailto:robherc@netzero.net>robherc@netzero.net</a><br><a href= > </a><br>*nix installation & program collector/reseller. Contact me if you think you've got one that I don't

 

[robherc]

Does nobody know how to low-lev read/write data from a device using QB 4.5?????? <p>-Robherc<br><a href=mailto:robherc@netzero.net>robherc@netzero.net</a><br><a href= > </a><br>*nix installation & program collector/reseller. Contact me if you think you've got one that I don't

 

[Alt255]

You could try using Interrupt 13, functions 2 and 3 (read and write sectors). I haven't tried it on a CD-R and don't recommend experimentation with low-level disk access. If CX and DX aren't precise you could end up overwriting disks C: to Z:. I'll give it some thought and e-mail you.

 

[robherc]

OK; thanks for your help.....I'm planning on using a <i>several</i> MB RAMdisk buffer to accellerate the process; hopefully will make exact, bit-for-bit duplicates this way a little faster than my other software does its cheap file-only copying junk & ruins my perfectly good, bootable CDs (or at least doesn't transfer the bootability to the copies)

 

[Alt255]

Bootability is low-level. The ROM/BIOS interrupts don't do well with the device-driven CDs.