this way you can also BACKUP THE ENTIRE MAC/ LINUX HARDDISK LINUX TO A FILE!
TEMPLATE
MacOS:
open terminal
1. first check where the cdrom was mounted via
mount
macbook:~
/dev/disk0s2 on / (hfs, local, journaled)
devfs on /dev (devfs, local, nobrowse)
/dev/disk0s3 on /Volumes/Mac OS X Install DVD (hfs, local)
2. then unmount via
sudo umount /dev/disk0s3
unmount disk
sudo umount
# dd bs=512 conv=noerror if=/dev/disk0s3 of=/Users/path/OSX.iso
# copy do not abort on read errors
to mount the image (fuer Linux-User):
mount -t iso9660 -r -o loop /pfad/image.iso /mountpoint
restore would be the other way around:
# dd bs=512 conv=noerror if=/Users/path/OSX.iso of=/dev/disk2s0
hope it helps
The watch command will will re-execute the kill command once every two seconds, giving you near-realtime status to what dd is doing. If you want to change how often the watchcommand polls for, you can change it with the -n parameter, for example to change the polling to every 5 seconds, you would use:
$ watch -n5 'sudo kill -USR1 `pgrep ^dd`'
… let the second terminal open, NOW SWITCH BACK to the first one and get this nice output:
root@Microknoppix:/mnt/qnap2/XEN# dd bs=512 conv=noerror if=/mnt/qnap2/XEN/xenserver3_2012_11_02_sda.iso of=/dev/sda ^N14354649+0 Datensätze ein 14354649+0 Datensätze aus 7349580288 Bytes (7,3 GB) kopiert, 274,756 s, 26,7 MB/s 14655017+0 Datensätze ein 14655017+0 Datensätze aus 7503368704 Bytes (7,5 GB) kopiert, 279,778 s, 26,8 MB/s 14885807+0 Datensätze ein 14885807+0 Datensätze aus 7621533184 Bytes (7,6 GB) kopiert, 283,599 s, 26,9 MB/s 14929225+0 Datensätze ein 14929225+0 Datensätze aus 7643763200 Bytes (7,6 GB) kopiert, 284,553 s, 26,9 MB/s 15237953+0 Datensätze ein 15237953+0 Datensätze aus 7801831936 Bytes (7,8 GB) kopiert, 289,571 s, 26,9 MB/s 15550857+0 Datensätze ein 15550856+0 Datensätze aus 7962038272 Bytes (8,0 GB) kopiert, 294,593 s, 27,0 MB/s 15846633+0 Datensätze ein 15846633+0 Datensätze aus 8113476096 Bytes (8,1 GB) kopiert, 299,648 s, 27,1 MB/s 16141825+0 Datensätze ein 16141825+0 Datensätze aus 8264614400 Bytes (8,3 GB) kopiert, 304,648 s, 27,1 MB/s
maybe you need to mount your NAS first:
mkdir /mnt/qnap2
mount -t cifs //192.168.0.231/BACKUP /mnt/qnap2 -o user=USER,pass=PASSWORD
if you only want to restore the master boot record:
dd if=/mnt/qnap2/XEN/xenserver3_2012_11_02_sda.iso of=/dev/sda bs=512 count=1
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