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Again, (Google) search is your friend
Well, first, no, Google is not mah friend, it's nobody's friend except those who run Google and those who benefit from their partnership with Google, and moreover, as you might know, doing a search on any Web search engine can lead to the right answer right away, but can also more often than not lead to a tremendous amount of B.S., or in between, answers which are technically correct but involve a prerequisite knowledge of the subject to be clearly understood, or technically correct but formulated in such convoluted or confusing terms that without an already comprehensive knowledge of the subject it's going to be misleading to anyone aiming at actually learning something, and that's why forums like this one exist, so that people of various knowledge and experience level can interact directly and collectively to quickly get to the point and separate facts from B.S. in a timely manner. {1} Perhaps the answer to those two questions is simple, from the point of view of someone who already knows it, but, since I've been reading quite a bit on the topic of HDDs and data recovery over the past few years, when I read something that I had never seen mentioned anywhere before, I tend to figure that it's quite advanced or arcane stuff, and, given the opportunity, prefer to ask someone who can provide a straightforward reply — in about as many characters as it requires to advise to go google it, possibly less — rather than going into yet another potential fool's errand, which I do too much already {2}, and which is highly likely given how the global signal-to-noise ratio of our world is dwindling on a yearly basis.
(Take that Marcel Proust and James Joyce. I'll reply in
haiku next time.)
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Honestly, when I want to do something with dd, I use ddrescue instead, partly because I am already familiar with the command format, but also because it already shows the progress, so no need for pv.
I, too, prefer to use ddrescue rather than dd with non defective devices (because more familiar with the syntax as well, and it provides useful options like “sparse” writing), but the point here was that the O.P. used dd, which should have worked well for the intended purpose, but did not, and therefore it's unlikely that using ddrescue or HDDSuperClone instead can fix the issue, since, for the intended purpose, they do nothing more.
{1} Take a breath, brace for second sentence.
{2} One recent example : yesterday, while translating subtitles for
this movie (which I highly recommend by the way), I searched what “SW Keihin” stood for, with those keywords all I got was a manufacture of cars and motorbikes carburetors founded in 1956, which could not be relevant to 1945 Nagasaki ; then I tried “
SW acronym”, and with a 2 letters acronym you can bet that I got a lot of irrelevant B.S., the first hit on page 1 being “sex worker” from the never disappointing Urban Dictionary... After about half an hour, I got some hints that “SW” might stand for “Shinjuku Ward”, but then I couldn't find an obvious association with “Keihin”, so I gave up, and just put “Shinjuku”, which may or may not be true — and noone will care whatsoever when watching the movie anyway.