Re: ddrescue error -help?

[Antonio Diaz Diaz]

Hi Stephen,

Stephen -WowMaths wrote:
> Thx for your ddrescue prog.

You are welcome. :-)

> *Can you suggest how I fix error*
> "*ddrescue: Bad or missing numerical argument*"
> after running command
> sudo ddrescue -d -o allow_root SDCARDmountPt SDcrdIMAGE SDcrdLOGMAP

I guess you are using an old version of ddrescue because latest ddrescue 
(1.27) prints a more informative message:

  ddrescue: 'allow_root': Bad or missing numerical argument in option '-o'.

The problem is '-o allow_root' because '-o' requires a numerical argument:

http://www.gnu.org/software/ddrescue/manual/ddrescue_manual.html#Invoking-ddrescue
-o bytes
--output-position=bytes
Starting position of the image of the rescue domain in outfile, in bytes. 
Defaults to --input-position. The bytes below bytes aren't touched if they 
exist and truncation is not requested. Else they are set to 0.

Removing '-o allow_root' should work and make a copy of the sd card (but I 
can't be sure if this is what you intend to do):

  sudo ddrescue -d SDCARDmountPt SDcrdIMAGE SDcrdLOGMAP


Hope this helps,
Antonio.