How long does it take to erase a HD

Discussion in 'macOS' started by E3BK, Jul 24, 2011.

  1. E3BK macrumors 68020

    E3BK

    Joined:
    Mar 15, 2008
    Location:
    NYC
    #1
    So I'm trying to perform a clean install on my 160GB MBP. It's been erasing for about an hour. Does it usually take this long?

    I actually am trying to reinstall Snow Leopard after an upgrade to Lion. I didn't realize a really really important work program is PowerPC based so I need to go back to SL.

    Of course...it's Sunday and I need to have it all back in order by 9am tomorrow. Great. :(
     
  2. simsaladimbamba

    Joined:
    Nov 28, 2010
    Location:
    located
    #2
    A clean install shouldn't take more than 30 minutes, you obviously enabled ZERO OUT in the Security Options inside Disk Utility before erasing the HDD, thus the HDD will be written to entirely with zeros, which should take around 50 minutes with a constant write speed of 50MB/s.

    There is no need to ZERO OUT The HDD during a clean install.
     
  3. bully worm macrumors regular

    Joined:
    Sep 17, 2009
  4. E3BK thread starter macrumors 68020

    E3BK

    Joined:
    Mar 15, 2008
    Location:
    NYC
    #4
    I actually did not check anything in the security options. I never clicked on it. I did what I've done in the past...boot from disk, choose drive, Erase tab. erase button. This is why I'm concerned. It's never taken this long before.
     
  5. E3BK thread starter macrumors 68020

    E3BK

    Joined:
    Mar 15, 2008
    Location:
    NYC
    #5
    Well thank you for being helpful. I will, obviously, live. But I have to get it all running by tomorrow morning. So just trying to guage if this is going to take 2 hours or 10.
     
  6. stevearm macrumors 6502a

    Joined:
    Nov 15, 2007
    #6
    I'm doing the same, clicked Erase about 10 minutes ago and apart from all the options blanked out, I'm not sure it's doing anything?

    Does a progress bar or any sign of life appear during this process??
     
  7. robgendreau macrumors 68040

    Joined:
    Jul 13, 2008
    #7
    What do you mean by "clean" install; Lion doesn't even have that option anymore.

    Are you just using Disk Utility to erase and reformat before installing??

    And I also wonder if you hit "erase free space" instead of "erase."

    Rob
     
  8. Gramp macrumors newbie

    Joined:
    Jun 15, 2011
    #8
    A standard erase of a 160GB 7200 rpm HD should only take much less than 1 hr.

    Can't think what's gone wrong other than the HD has suddenly developed a mechanical problem.

    There is no progress bar for an erase, just an activity strip at the bottom right showing names of what is being erased & reformatted.
    That moves too quick to read most of it as I recall.

    Please report back on the final outcome to add to the knowledge base.

    In Steve's case, if there is no activity strip, I can only guess that you did not boot from the optical drive in order to perform the Disk Utility HD maintenance.
    An error message under that circumstance might be helpful, but I guess there isn't one.
     
  9. Gramp macrumors newbie

    Joined:
    Jun 15, 2011
    #9
    No update from the OP!

    Erase still running 36 hrs. later?
     

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