Ubuntu

An enhanced version of GNU dd called dcfldd is often used by forensic examiners. It outputs status messages continually to stderr.

I use GNU dd quite often, and sadly think this is more than opinion. Nothing went wrong, you just got impatient. Copying a terabyte of data can take ages, even when you're getting ideal transfer rates(which you often don't).

It may also have gotten hung up for some reason, though that seems unlikely. dd will print error messages if you start getting read or write errors. Yes, it prints statistics whenever it quits for any reason. That doesn't mean it finished. All dd has to do is while(!eof) { read(buffer); write(buffer); }. That's a whole lot of transfer for very few instructions, so 99% of the time is spent asleep waiting for the disk to catch up. Most processes spend 99% of their time asleep, waiting for I/O.

Thanks for reporting back, Royalist..

For your goal IMHO it's better (and easier) to use dd_rescue than dd, even better to use ddrescue. And you learn to use something useful in case of hardware problems (dead sectors). For some more info:
System Administration Bits of Knowledge

To install and learn dd_rescue in Ubuntu:

Code:

sudo apt-get install ddrescue
man dd_rescue

Yes, dd_rescue is in package ddrescue (Debian and Ubuntu).

To install and learn ddrescue in Ubuntu:

Code:

sudo apt-get install gddrescue
man ddrescue

Yes, ddrescue is in package gddrescue (Debian and Ubuntu).

For single partitions, best (and often much faster) is to use Partimage.
--
Bye

dd_rescue is indeed simpler and more convenient if you have it, which is why I suggested it earlier.

Yes, thanks. I do have dd_rescue, but have not tried it as yet.