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Re: [Bug-ddrescue] ddrescue and NTFS-3g


From: Antonio Diaz Diaz
Subject: Re: [Bug-ddrescue] ddrescue and NTFS-3g
Date: Fri, 22 May 2009 21:05:39 +0200
User-agent: Mozilla/5.0 (X11; U; Linux i586; en-US; rv:1.7.11) Gecko/20050905

Corey Flood wrote:
With that all said, I know there would be issues in doing data recovery with
large block sizes (higher rate of missing data, etc.), but I am wondering if
the asynchronous switch would be able to help with this, or perhaps a quick
run through with a large block size, no trim, etc, then a second pass with a
smaller one.

I suppose you mean the "--synchronous" switch. This switch issues a fsync call after every write to the output file. Not sure if this will help with the NTFS problems.

You can't avoid the trim without manually interrupting ddrescue. What you can try is a first pass with --no-split and a large value for --cluster-size, say 1024, followed by a default pass with --retrim, --try-again and perhaps --direct:

  ddrescue --no-split --cluster-size=1024 in out log
  ddrescue --retrim --try-again --direct in out log


Regards,
Antonio.




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