Re: [Bug-ddrescue] 10KB/sec data recovery rates - possible cause?

[Paul L Daniels]

On Tue, 18 Jun 2013 20:12:32 +1000
Paul L Daniels <address@hidden> wrote:


>       I have a client 1TB WD 2.5" drive from a portable enclosure
>       which failed on their system.  On start up there's no clanking
>       or banging ( good sign! ) but it's *incredibly* slow to read,
>       we're talking a peak of ~15KB/sec and an average of 10KB/sec.

FURTHERING to this... I've noticed that every time I restart ddrescue
I'll get the first 2MB or so in at a much higher rate for a short burst
until it drops back to the ~15KB/sec.   

Does ddrescue initialise anything special at the start that could
possibly explain this behaviour?

It's not a time-shift/hiccup transient, because if I put a 1 second
delay between each update it'll transfer it in 32KB blocks/sec until
again it runs in to that ~2MB limit.

Paul.



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