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Re: [Bug-ddrescue] ddrescue --reverse


From: Antonio Diaz Diaz
Subject: Re: [Bug-ddrescue] ddrescue --reverse
Date: Mon, 12 Nov 2012 21:11:24 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i586; en-US; rv:1.7.11) Gecko/20050905

Hello Ole,

Ole Tange wrote:
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.

Thanks for pointing this out.


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.

More or less, but --reverse is a little more complicated than that; it reverses the direction of all copy operations. The passes which are normally run forwards (copying, splitting and retrying) are run backwards, while the pass which is normally run backwards (trimming) is run forwards.

I'll clarify the description and include an example.


Best regards,
Antonio.



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