How long does it take to convert a cdr to an iso?
I believe this is the correct answer. I've successfully use similar commands as shown in the article.
Why are people so negative? They are not providing any answers. It's easy to complain.
There should be a requirement that people explain themselves when they downvote something. How am I to improve?
In the Stack Exchange community (and espically so in Ask Different) we have what I like to affectionately call "the voting horde." And within this horde there are two factions, the "up vote brigade" and the "down vote posse."
I have literally seen questions which were not only off topic for having nothing to do with Apple products but actually make no sense receive what seems like the "automatic up vote" and answers which are well thought out and reasoned get down voted faster than quick.
It's the nature of the beast.
It's happened to me several times as it's happened to countless others. Don't allow it to discourage you - just put in your best and honest effort and pay them no mind. Your efforts will speak for itself and don't worry, veterans like myself will share with you what we find wrong (and in many cases what's right!) in your post (without the down vote, ironically).
Don't forget, it takes 5 down votes to cancel one up vote.
There's an old adage that I heard years back that applies to situations like this:
It takes a craftsman to build something, but any mule can knock it down.
As for what's wrong with you post?
Nothing. Keep being the craftsman.
It doesn't answer the question, in part because the question doesn't make sense. (I just attempted to write my own answer, but as I explained within it, I'm stuck guessing what the asker is trying to do.) There are numerous hints in the question and subsequent comments that the asker found the wrong command for the job. The command they're running does something completely different from what they want to do, so asking why it's taking a long time isn't useful. When they try your command, it's still not going to do what they want.
There are some terminology issues with your post. I wouldn't warrant that worthy of a downvote--yes, bs actually stands for block size, but it probably also affects the buffer size.
It's definitely not a great idea to pipe dd directly to another dd process, though I see where you got the idea; in your example, you've got another command in between. However, the example provided by the asker indicates that there's no need for an intermediary command--or, at least, that would be what it indicated if they were on the right track, which they're not.
When someone asks the wrong question, answers are inevitably going to be controversial. Opinions vary widely on how you should proceed. Some would rather that ignore the discrepancies and attempt to answer the literal question, thereby helping people who arrive from search engines. Others would rather that you read into the asker's intentions and provide an answer that helps the asker, rather than people arriving from Google. Still others want you to leave a comment and downvote the question.
In this scenario, there's no winning answer. You can see that my answer was almost immediately downvoted. It's probably going to continue to get downvoted.
Edit: I just saw someone mention the term "XY problem" elsewhere on AskDifferent. It's a pretty fitting explanation for the problem here.
