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Re: [Bug-ddrescue] Version 1.15-rc1 of GNU ddrescue released

From: Antonio Diaz Diaz
Subject: Re: [Bug-ddrescue] Version 1.15-rc1 of GNU ddrescue released
Date: Thu, 29 Dec 2011 17:29:07 +0100
User-agent: Mozilla/5.0 (X11; U; Linux i586; en-US; rv:1.7.11) Gecko/20050905

Hello Dennis,

Dennis Juhler Aagaard wrote:
First i like to thank you for a really great program. I use it almost
daily. :-) I use it on Mac OS X both Snow Leopard and Lion, and i
think i have found a bug. I just want to let you know before you
consider releasing any staple version of the Version 1.15.


When i try to recover harddrives larger than about 320Gb, the speed
of the recovery goes from 20-40 mB/s down to merely 200kB/s after
320'ish Gb rescued data and the ddrescue program start consuming
about 100% of processing power.

What is the filesystem of the destination drive? Some filesystems like NTFS3g seem to have problems writing large files.

What is the size of the logfile? Writing a very large logfile also could cause this problem.

Firstly i thought it was because of a faulty drive, but now i am
beginning to see a pattern here with several disks.

Do you mean "several source disks, but maybe the same destination disk"?

I use the command sudo ddrescue -S -r3 /dev/diskXsX /PATH/DiskImage.dmg 

Have you tried without the '-S'?

And that command is the one i have been using in a script for the
last 2 years or so. so that shouldnt be the problem. I'll investigate
further, but i am not the C-developer shark, actually i am just at
the beginning of learning objective-c to wrap up your program in a
nice GUI running on the Mac OS X.

Ddrescue uses 64-bit sizes, which means most probably slow recovery is because of some filesystem problem rather than a bug in ddrescue. Finding the cause surely does not require to be a C-developer shark. :-)

Best regards,

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