How to edit ddrescue log file to resume at a certain spot?

I'm trying to image a 500GB disk using GNU ddrescue and using the log file. I got to 420GB and then I stopped it with ctrl+c. I ran the command again after some time and it started all over again, despite there being a log file.

The old log file has been written over by ddrescue.

Like I said, my image file so far is 420GB out of a 500GB disk. How do I edit the log file or tell ddrescue to resume from around 420GB?

Here's the log file:

# Mapfile. Created by GNU ddrescue version 1.21
# Command line: ddrescue /dev/sdd /media/myname/New Volume4/backup.dmg /media/myname/New Volume4/logfile.log
# Start time:   2016-05-17 13:08:39
# Current time: 2016-05-17 13:08:48
# Copying non-tried blocks... Pass 1 (forwards)
# current_pos  current_status
0x0C770000     ?
#      pos        size  status
0x00000000  0x0C770000  +
0x0C770000  0x7464496000  ?

Recent Questions...