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Old 8th November 2010
guitarscn guitarscn is offline
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Default Cannot fill external hard drive with /dev/random?

# dd if=/dev/random of=/dev/sd1c &
dd: /dev/random: Input/output error
0+0 records in
0+0 records out
0 bytes transferred in 0.000 secs (0 bytes/sec)
But "dd if=/dev/urandom of=/dev/sd1c &" works fine. Is /dev/random not supposed to be used or something?
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Old 8th November 2010
jggimi's Avatar
jggimi jggimi is offline
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Please read the man page for random(4).

You will save yourself a great deal of time if you installed and used the man pages for the OS. It is much faster to type "man random" or "man 4 random" than to post here.
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Old 8th November 2010
ocicat ocicat is offline
Join Date: Apr 2008
Posts: 3,298

guitarscn, I see you are beginning to post your questions in tandem both here & on the official misc@ mailing list:


This is known as "shopping for answers".

While you are free to post anything to any site or mailing list, recognize two things:
  • You might be negatively dissuading regulars here from answering your questions. It takes time to research & compose useful responses. The mindset will soon become "Why should I answer this question? It is going to duplicated on misc@ anyways..." as a number of us follow misc@ quite closely.
  • The misc@ mailing list is monitored by the project developers. They don't answer all questions, but many are aware of the mailing list traffic. Recognize that many of the developers have been doing this for years & they have seen many questions more than once. Sometimes, way more than once. Their patience can run very thin, & some have no problems whatsoever in bluntly calling people on their lack of doing fundamental research. Some of us have had our heads handled back to us in very unflattering responses -- even a litany of responses where a number of people have to take their shot at kicking the unwashed. If you continue to post on misc@, do so being prepared by having done exhaustive research, or expect at some point that someone may call you on being very lazy. This is why I pointed you to an older thread here:


    ...which points out a multitude of things members should consider before asking others to spend time resolving their problems.

    Likewise, recognize that the developers would rather develop, not provide simple support. If they engage you in (brief) conversation, they will expect you to be functioning on an experienced technical level. While they might expect you not to understand every facet of their answer, they will expect you fill in the holes yourself.
Again, I am offering this simply as a cautionary omen of what traps people can blindly walk into. I/we have seen it before, & I'm sure we will see it again. So, be forewarned.

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