[Bug-ddrescue] GNU ddrescue suggestion - Include critical warnings into program and top of manual

[wilsonstreet]

Hi Antonio,

To help avoid any misunderstandings and reduce the chance of
disaster,

any critical requirements for the operation of the program ;


1) could be mentioned, referred to, or covered at the
front/top of the manual.

2) could be mentioned within the program. (e.g. generate
logfile by default, using name of image with suffix
name.log, check that input source is not mounted as rw, ask
user if the disk has been reporting IO errors before
actually doing any extraction operation, if destination is a
drive or partition then warn the user before doing any
extraction operation.)


These include
(from manual 
http://www.gnu.org/software/ddrescue/manual/ddrescue_manual.html
)
IMPORTANT! Always use a logfile unless you know you won't
need it. Without a logfile, ddrescue can't resume a rescue,
only reinitiate it.

IMPORTANT! Never try to rescue a r/w mounted partition. The
resulting copy may be useless.

IMPORTANT! If you use a device or a partition as
destination, any data stored there will be overwritten.

IMPORTANT! If you interrupt the rescue and then reboot, any
partially copied partitions should be hidden before allowing
them to be touched by any operating system that tries to
mount and "fix" the partitions it sees.

IMPORTANT! Never try to repair a file system on a drive with
I/O errors; you will probably lose even more data. 

ie "file system on a drive" do not repair it "ON" the drive.
- but can it be extracted/copied/imaged/ddrescued to a file
then repair the file?

Yours
Al