Can't format flash drive

Discussion in 'Mac Accessories' started by iVikD, Dec 2, 2011.

  1. iVikD macrumors regular

    iVikD

    Joined:
    Sep 11, 2011
    Location:
    Spain
    #1
    Hi, I've been trying to format a flash drive, but always get an error when trying to format.
    The error reads "Unable to write to last block of the device."
    Here's some screenies of a verification and attempt at repair.

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    [​IMG]

    Any reason why it's like this? Any way to fix this drive?
    Thanks.
     
  2. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #2
    You might try going to the next tab over in Disk Util and remove the existing partition (U3) and then add back a new partition.
     
  3. iVikD thread starter macrumors regular

    iVikD

    Joined:
    Sep 11, 2011
    Location:
    Spain
    #3
    Tried, get same "can't write to last block" error.
     
  4. Weaselboy Moderator

    Weaselboy

    Staff Member

    Joined:
    Jan 23, 2005
    Location:
    California
    #4
    Hmm... did it ever work or is this a new USB key?

    Sandisk was doing some wierd things with hidden partition on their USB keys as part of some sort of auto start software they had. There was a Windows exe you could DL to remove it, but no equivalent app to do the same in OS X. I wonder if that is what is causing the problem? Here is some discussion on it. (I see in that thread there is a link to a OS X removal tool)
     
  5. iVikD thread starter macrumors regular

    iVikD

    Joined:
    Sep 11, 2011
    Location:
    Spain
    #5
    Yeah, at some point it worked. When my friend gave it to me, it was in RAW format. The only other time I've seen a drive act this way was when forcefully removed during a formatting operation. I'll check the link and see if that's a fix.
     
  6. M1LK3Y macrumors newbie

    M1LK3Y

    Joined:
    Dec 4, 2011
    Location:
    Baton Rouge, LA
    #6
    RE:Can't format flashdrive

    I use a SanDisk USB and I remember it having that file management program on it. I just loaded it into Disk Utility and restored it to a random Unix .iso I had downloaded previously then reformatted and erased.
     

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