FWIW: My recent experiences with copying SSD's...
I recently installed Ubuntu Mate from USB stick to a 120GB SSD. I then updated with all
the latest patches. This took about 30 minutes.
I then tailored my preferences of Firefox, Terminal, Pluma, etc. Created a Guest account.
Installed the NZ dictionary, and added some applications. This took me another 30
I then needed to do this to 5 more computers. So, to prepare six computers would have
taken me a total of about 6 hours.
I considered using the utility "dd" to copy a clone of my master disk. Looking
I found the suggestion to use "cat". I.e. Boot Ubuntu from a USB stick and
assuming sda is my master disk and sdb is the clone, then issue the command...
$ sudo sh -c 'cat /dev/sda >/dev/sdb'
I found this copying took about 15 minutes. However, it didn't give me any progress
report during the copying sequence. I then...
$ sudo apt install pv
...pv stands for "Pipe Viewer". For the next SSD drive to be cloned I issued the
$ sudo sh -c 'pv /dev/sda >/dev/sdb'
...which then provided a progress bar that updated every second.
With Samsung SSD 120GB drives I found the operation took 13 minutes 13 seconds with a
transfer rate of 153MB/s.
I later had built another master SSD on a Kingston 120GB SSD and cloned this to another
Kingston 120GB SSD which took 10 minutes and had a transfer rate of 200MB/s.
I found with the system still powered on, I could unplug the cloned SSD and plug in
another blank SSD and start another cloning. Probably not a recommended practice.
After booting the clone, I edited /etc/hostname to make each clone unique. Maybe
there's something else I should change???
In summary, allowing for a bit of time to physically move the SSD's between machines,
I was effectively completing the installation/updating/tailoring at a rate of three
PC's an hour.
I dunno if this was the right way or the best way, but, so far, the masters and all the
clones seem to be working OK.