Boot CD - The last LAP - test-drb@ccmp.vtda.org

15 Jun 2007

At 03:07 PM 6/15/2007, Jason T wrote:
...
 On 6/15/07, Rick Murphy <rick at rickmurphy.net>
wrote:

 A process known to work (I used this to copy the
VMS Hobbyist CD:

dd if=/dev/cdrom of=vmscd.iso bs=32768
cdrecord vmscd.iso 
This thread has been educational - I had assumed that VMS and other OS
discs were essentially "uncopyable" under PC software.  So will the
above process(es) also work with IRIX, NeXT, MacOSX and other format
discs (sorry I don't know the proper names of those formats?) 
The low-level format of a CD is defined by a standard that everyone 
follows. That means that you can use simple low-level tools to copy 
...
 from a CD (and copy back on to a blank CD-R). You can
do the same thing  with SCSI disks for the same reason: it's just a bunch of
bits with a 
standard hardware interface; it doesn't matter what format the OS uses. 
Using dd to copy from one disk to another works a treat when you're 
using SCSI devices (modulo bad blocks, etc.)

For SCSI disk copying, it's best if the source and destination are the 
same size. For a CD, that's taken care of.
         -Rick