CompTIA Linux+ XK0-006 (V8) Practice Question

The third, positional argument that follows outfile is ddrescue's mapfile. Re-using the same mapfile lets the program skip blocks that were already copied and pick up precisely where it stopped. Without it, ddrescue would start a new rescue from the beginning and recopy good areas .

Adding -d enables direct (uncached) reads from infile, and -r3 tells ddrescue to make up to three retry passes over the sectors still marked bad in the map .

The correct syntax is therefore:

ddrescue -d -r3 /dev/sde /mnt/recovery/disk.img recovery.map

Why the others are wrong:

• The option that omits the mapfile will restart the whole copy.

• The command that still uses -n skips the scraping phase, so the rescue remains incomplete .

• The variant with the mapfile placed before infile/outfile breaks ddrescue's required positional order (infile outfile mapfile) and will be rejected by the program.