I was trying to wipe the free space of an external USB 3.0 disk in OS X (Yosemite) disk utility. However, I receive the following error:
EDIT: The disk is formatted as GUID / Mac OS Extended (Journaled) and 1.1 of 2.0 TB are occupied.
- Do you know what the cause / solution could be? Disk Repair returns no errors.
- Do you know of a terminal command to wipe free space?