[Bug-ddrescue] ddrescue --reverse

[Ole Tange]

I am looking a the man page and info page of --reverse.

I have been unable to find an example using --reverse and the
description is not so clear that I dare try it on important data.

If I am correct, then the man page can be changed to:

`-R'
`--reverse'
     Reads sectors in backwards order. This is useful if the disk goes
offline when reading a failing sector. By starting after the failing
sector and going --reverse you work your way down to the failing
sector. --reverse does _not_ reverse which file is input and output.

Example:

Sector 12345678 and some of the following sectors causes sda to freeze up.

# Try to copy everything
ddrescue /dev/sda /dev/sdb logfile
<<When reaching sector 12345678 /dev/sda freezes. Reboot is needed.>>
# Copy the rest - starting a safe distance from the troubled sectors
ddrescue -i 12350000 /dev/sda /dev/sdb logfile
# Copy backwards down to the troubled sector
ddrescue --reverse -i 12350000 /dev/sda /dev/sdb logfile


/Ole