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[Bug-ddrescue] Slow reads for x time to exit and whitespace skipping

From: Cameron Andrews
Subject: [Bug-ddrescue] Slow reads for x time to exit and whitespace skipping
Date: Sat, 21 Jan 2017 21:19:29 +1000
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.5.1

Hi Antonio,

I have a couple of requests if at all possible to include them in the next version:

Firstly, if the --min-read-rate and --max-slow-reads configuration could be extended so it could be possible to include a timeout, so, I would set --min-read-rate and then --max-slow-read-time=60 or something like that. So if it sits at or below the minimum for that length of time, it would exit ddrescue... Alternatively to this, could you send ALL the error codes to stdout? Not just 0, 1, 3 ... Then I could write a script to get around the time issue.. I presently have a drive which runs fine for a random period of time, then just goes slow, a power cycle and it's fine.. I'd like to automate this process..

Second request is for a whitespace detector, hopefully it's not outside the scope of ddrescue and isn't as hard as it sounds. But basically on really slow drives, yet large drives which have data spread sparsely for whatever reason, it would be good if ddrescue could be told to jump forward xM read, if it sees whitespace, then skip again. Then when it finds data, it skips backwards in much smaller increments until it finds whitespace again, and then starts recovering the drive normally till it hits more whitespace, then repeats...

I hope that is enough of a description of my requests, let me know if not. Thanks for doing such a great job!

Kind Regards,
Cameron Andrews

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