![]() Reboot your system using the Macintosh HD drive and enjoy your clone! And when we say bit-wise perfect we mean it. Now you've got a bit-wise perfect clone of your Macintosh HD drive. The last block written was a short block because there wasn't a full 1MB block to copy. That last error message is actually okay. When dd finishes you may see an error like this: dd: /dev/rdisk2: short write on character deviceĥ00107862016 bytes transferred in 14584.393113 secs (34290619 bytes/sec) Start the clone with: > sudo dd if=/dev/rdisk0 of=/dev/rdisk2 bs=1m conv=noerror,sync ![]() Let's say that Macintosh HD (disk0) is the source and Clone (disk2) is the target for our dd operation. For example: > diskutil listĢ: Apple_HFS Macintosh HD 319.2 GB disk0s2ģ: Apple_Boot Recovery HD 650.0 MB disk0s3 One of them will be your target drive you're trying to clone. Run diskutil to get a list of your available drives. With your machine booted to your secondary boot disk, log in and fire up a Terminal or iTerm window. ![]() Otherwise you risk copying things that are in incomplete states on disk. ![]() ![]() Your source for the clone should be an offline volume, not in use, when you're making the copy. To prepare for the clone I recommend creating a secondary boot disk that you can boot from. In order to make the clone perfect you'll need to ensure the source and the destination aren't actively in use. It's a command line tool that ships with OS X. You can use the dd command to make a bit-perfect clone of a drive. ![]()
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