How can I make a precise copy of a damaged HFS+ volume?

Discussion in 'macOS' started by david06, Sep 11, 2009.

  1. david06 macrumors member

    Jun 19, 2006
    I have a damaged HFS+ volume on a storage appliance (Drobo). It does not mount in the Finder but it is visible with Disk Utility and Data Rescue II, and I've copied quite a bit of data off of it using Data Rescue II. However, because of a separate issue everything on the Drobo is currently read-only.

    I would like to copy the damaged volume (about 1.1 TB) as-is to a fresh 2 TB hard drive so that I can then attempt to repair the volume using Disk Utility or other utilities. There is no other way for me to overcome the read-only status of the Drobo. I'm looking for the best way to do a sector-by-sector, block-by-block, or byte-by-byte copy of the damaged volume... whichever of those might be the correct term for what I'm describing.

    Any suggestions on the most reliable way to do this? I am open to command line stuff, some function in Disk Utility I'm missing, or third-party software.
  2. angelwatt Moderator emeritus


    Aug 16, 2005
    Ones to look into:
    Carbon Copy Cloner
    Command line tool dd (you can search tutorials on how to use it)

    I don't know how these tools will perform on a damaged disk though.

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