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.