Cant 'Partition' new USB to make it bootable installation (to create an external drive as boot drive)

Cant 'Partition' this. It is surprising to the Partition button is disabled . Only "Mount" and "partition" buttons are disabled. but 'First aid' & 'Clear' is enabled.
Just unpacked new 16 GB USB3 drive get ready. (Updated to OS from Yosemite to El Capitan 10.11.2 and yesterday I could use the "Partition" command for internal MacHD & created test drive encrypted partition 50 GB)

I want to do a clean installation fees, so I wanted to create this boot ext backup disk before deleting the disk macHD internal.


Erase the disk via disk utility and then partition the system - regardless of the current format was used at the plant probably lack the TPG structures which should.  Does erase everything on the drive, so be sure that there is nothing on the disk you need.

Tags: Mac OS & System Software

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