How can I resolve this error during a dmg copy operation I am trying to copy a 200GB dmg file between two disks (one firewire, one local) and see this error:

The Finder can’t complete the operation because some data in “mbp_18_06_2011.dmg” can’t be read or written.
(Error code -36)


How can I debug / fix?
You can try copying the data using Terminal 

Type in sudo ditto ~/sourcefile ~/Destination

Replace "~/sourcefile" by dragging the file you want to copy into the terminal window which will autofill, and do the same with the "~/destination"

Alternatively: sudo ditto -V ~/sourcefile ~/Desktop
This will show you progress and any errors as the files are being copied