Hi All, I am trying to format a 3TB WD Elements (USB 2) external HD, GUID, 1 Partition Mac Extended Journaled. The formatting goes ok. If I click on the "3TB WD Ext HDD 1021 Media" on the left in Disk Utility and hit "verify disk", I get the following error message: "Checking the EFI system partitions file system Problems were found with the partition map which might prevent booting Error: The partition map needs to be repaired because theres a problem with the EFI system partitions file system." A 'repair disk' goes through without hitch, but if I hit 'verify disk' again, I get the same error. I wonder if I can just disregard this or if I will encounter problems somewhere down the line. Thank you very much for your help.