Help, please! Time Machine suddenly won't allow me to use a firewire external hard drive. I get the message: you do not have appropriate access privileges to save file ".001b63a9cdcd" in folder "External" No such file can be found on the computer, even with file extensions revealed. Trying to change permission with Get Info doesn't work. I don't want to have to re-format. Is there a fix for this, or a known cause? It seems to have occurred after auto updating. Thanks in advance.