My little external USB hard drive has started having problems. Although it appears in the Disk Utility app, it won't mount. When I try and verify or repair it, I get the following error: Code: Verify and Repair volume Little Disc Checking Non-journaled HFS Plus volume. Invalid node structure Invalid B-tree node size Invalid node structure Invalid B-tree node size Volume check failed. Error: Filesystem verify or repair failed. Is there anything I can do to try and repair it, it is an erase my only option? Thanks all!