Tom

I've used the same progress code as the original piclone program. There is a delay of 1 - 10 seconds between every update depending on how much data is to...

Maybe a lot of small files get copied after 18% slowing down the du command.

I've replaced the du command by df command which seems to work faster but maybe a little less accurate.

Seems there is still some disk I/O after the copy command finished which makes the umount command fail. umount should wait until all disk I/O has finished I guess, will...

Can you check if the truncate command is still running in the background when the program hangs?

Depends on the access speed of your SD card, destination card, Raspberry Pi version and maybe other programs running on the Pi.

It is not as simple as 64Gb/66.3Mb because after creating the .img file it runs a file copy command. This means all files will be copied individually, each file generates...

Never had any problems with Win32Diskimager when reading a card. You could also try CloneDisk if you don't like the Win32Diskimager.

Yes you can stop and shutdown but the image will just not be complete.

That's what the -p command line parameter does automatically to show copy progress.