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Old Jun 19, 2009, 04:49 PM   #1
ACiB708
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Mac OS Terminal: dd command

Hey all just wanted to know what I'm doing wrong.

In linux if I want to dump the contents of a CD/DVD onto a path I type:

sudo dd if=/dev/cdrom of=/root/user1/desktop/cdrom.iso (or whatever path)

Linux does it's thing and after a while I get the file I wanted. Since Mac OS is also UNIX-based and this is a UNIX command, I'd expect it to be the same. So I type:

sudo dd if=/Volumes/cdname of=/Users/username/Desktop/cd.iso

but when I hit enter instead of doing something, it instantly shows me this:

0+1 records in
0+1 records out
136 bytes transferred in 3.596678 secs (38 bytes/sec)

And it gives a 4KB file, or sometimes an empty file. What am I doing wrong?
Thanks for any help in advance!
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Old Jun 19, 2009, 05:51 PM   #2
pilotError
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http://blog.calileo.net/?p=46
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Old Jun 19, 2009, 07:02 PM   #3
ACiB708
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Quote:
Originally Posted by pilotError View Post

Oh, so it was because in Darwin you have to unmount the volume first... and also not copying the image from the /Volumes dir but instead form the device itself?? Thanks a lot it helped.
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