Hi, I've have an external USB3 Toshiba 2TB drive with about 200 gb free space. I wanted to add a partition to it so I used disk utility to add a partition. It's been one hour and disk utility is still resizing. I had this issue with another 2.5" drive in an Anker usb 3 dock but it would remount and not work. I'm trying to create a bootable drive for emergency purposes on Yosemite. Is it best to partition on empty drive? Is it supposed to take so long just to resize? Thanks.