|Subject:||Re: [Bug-ddrescue] When will another pass help?|
|Date:||Fri, 18 Apr 2008 12:55:04 -0400 (EDT)|
Where does the advantage of a second pass come from? Does it presume thatThat's a great question. Although block devices are digital (ones and zeros), the media on the platters of your hard drive are analog. That means that subsequent reads to the same block can yield different results. The hard disk's controller deals with this and performs error correction all the time, you are just abstracted from it.
the problem is elecrical or hardware related and thus not static over time?
Or would there be an advantage if the problem were purely media related
(jelly stain on a cdrom) and therefore a stable reproducible error?
Every time I juice a lemon, it seems that I can always squeeze out one last drop if I try again.
Can we tell by looking at the logfile of the first pass if another will
help, or is it better to run multiple passes and evaluate for diminishing
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