224
96
Both command-line and screen-oriented pointers appreciated!
update:
I verified the disk utility, hdiutil, and dd methods. dd seems the fastest, 30 minutes on my macbook pro vs. 40 minutes for hdiutil. I was able to simplify dd to use just if=
and of=
For the DVD, I used /dev/disk2. I verified this with diskutil list
and unmounted it first.
$ sudo umount /dev/disk2
$ dd if=/dev/disk2 of=mydisk.iso
1I had to use
sudo diskutil unmount /dev/disk2
notsudo umount /dev/disk2
– nikans – 2014-09-11T21:44:53.860In my case I had to do the following (OSX 10.9.5): sudo umount /dev/disk3s0 ; sudo dd if=/dev/disk3s0 of=mydisk.iso – Oisin – 2014-10-18T18:12:00.333
Actually, when running
dd if=/dev/disk2 of=mydisk.iso
on Yosemite I gotdd: /dev/disk2: No such file or directory.
Butdd if=/dev/disk1 of=mydisk.iso
worked, it's creating the image now. Why is that? The DVD is a bootable Linux DVD. Also, the first command gavedisk1 was already unmounted or it has a partitioning scheme so use "diskutil unmountDisk" instead
. Is this normal? – Revetahw says Reinstate Monica – 2016-10-16T07:28:40.987Yeah dd is the fastest, it is the disk druid, after all! :) – msanford – 2010-11-30T21:46:09.420
why did you unmount disk2? I thought you need to leave the DVD drive mounted, so you can read the data from it? – Pure.Krome – 2011-01-11T22:55:45.407
3@Pure.Krome, for this purpose, /dev/disk2 is a file of several GB length. The directory structure is embedded in those bytes. IIRC, I had to umount in order to read /dev/disk2. – Mark Harrison – 2011-01-12T21:15:36.167