root@PartedMagic:~# ddrescue -n /dev/sda /dev/sdb rescue.log
Press Ctrl-C to interrupt
Initial status (read from logfile)
rescued: 102105 kB, errsize: 500 GB, errors: 1
Current status
rescued: 102105 kB, errsize: 500 GB, current rate: 0 B/s
ipos: 160081 MB, errors: 1, average rate: 0 B/s
opos: 160081 MB, time from last successful read: 2.6 h
Splitting failed blocks...