How to completely wipe a USB drive clean - disk utility doesn't work

Discussion in 'Mac Basics and Help' started by TijmenDal, Oct 6, 2012.

  1. macrumors member

    Sep 15, 2010

    So I transfered an ISO image to a USB stick using a couple terminal commands.
    Now, I want to get rid of the image, but all the options are blocked out? Which is weird. Is there a Terminal command or something to reset the disk? Because now my disk it rendered useless (which kinda sucks...)

  2. macrumors 604

    Aug 9, 2009
    What Terminal commands did you use to copy the ISO? Where did you get them from (URL of website, or whatever you read that told you what cmds to use)?

    What kind of USB stick is it (model, capacity)?

    You say "all the options are blocked out", so please take a screen shot and post it.
  3. thread starter macrumors member

    Sep 15, 2010
    They're just 'unclickable' you, know the light gray.

    I got the terminal command from internet; various sources gave the same command. I'm no coding-genius, but the command was legit.

    I unmounted the disk and then used 'dd if= *Iso location* of=/dev/disk bs=1m
  4. macrumors member

    Apr 27, 2012
    If there is nothing on the drive that you want, have you considered inserting the drive into a windows machine. If it doesnt detect it as a valid drive then it may possibly offer you the option of reformatting the drive.
  5. thread starter macrumors member

    Sep 15, 2010

    Thanks. That's actually a good idea! Will try

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