This link has been bookmarked by 12 people . It was first bookmarked on 11 Jun 2008, by Sander van Zoest.
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Here's the process... 1. To determine the path to the CD's device file, insert the CD, and let OS X mount it to your desktop. 2. In Terminal, run the following command, and take a look at the result: Spinnaker% df -k /Volumes/* Filesystem 1K-blocks Used Avail Capacity Mounted on /dev/disk1s0 659122 659122 0 100% /Volumes/Data_DRNA_100a /dev/disk0s3 58474008 49279888 8938120 85% / Spinnaker% Somewhere in there you'll see the CD. Look at the beginning of that line, under "Filesystem" -- that is the name of the device file. Select and copy it. You have to be logged in as an administrator, and provide your password, to do this. 3. Unmount the CD's volume (without ejecting it :-) like this: Spinnaker% sudo umount /dev/disk1s0 Password: Spinnaker% You should see it disappear from the desktop. Now dd can access the device file. 4. Run the actual dd command, using the device file as the "/path/to/InputFile". This puts it in your home directory, but you can put it wherever you want: Spinnaker% dd if=/dev/disk1s0 of=$HOME/outfile.iso bs=2048 Spinnaker% Note the distinct lack of feedback on whether anything is happening at all, save for your CD spinning up, and this command taking a good 10 minutes to complete before you get your prompt back. Whether the current Disk Utility has the same flaws as previous ones, I can't comment on, nor have I anything to say on whether the bs=2048 is all it takes for a magic incantation to get this to really do an exact disk-level duplicate.
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Here's the process... 1. To determine the path to the CD's device file, insert the CD, and let OS X mount it to your desktop. 2. In Terminal, run the following command, and take a look at the result: Spinnaker% df -k /Volumes/* Filesystem 1K-blocks Used Avail Capacity Mounted on /dev/disk1s0 659122 659122 0 100% /Volumes/Data_DRNA_100a /dev/disk0s3 58474008 49279888 8938120 85% / Spinnaker% Somewhere in there you'll see the CD. Look at the beginning of that line, under "Filesystem" -- that is the name of the device file. Select and copy it. You have to be logged in as an administrator, and provide your password, to do this. 3. Unmount the CD's volume (without ejecting it :-) like this: Spinnaker% sudo umount /dev/disk1s0 Password: Spinnaker% You should see it disappear from the desktop. Now dd can access the device file. 4. Run the actual dd command, using the device file as the "/path/to/InputFile". This puts it in your home directory, but you can put it wherever you want: Spinnaker% dd if=/dev/disk1s0 of=$HOME/outfile.iso bs=2048 Spinnaker% Note the distinct lack of feedback on whether anything is happening at all, save for your CD spinning up, and this command taking a good 10 minutes to complete before you get your prompt back. Whether the current Disk Utility has the same flaws as previous ones, I can't comment on, nor have I anything to say on whether the bs=2048 is all it takes for a magic incantation to get this to really do an exact disk-level duplicate.
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