Then right-click or Control-click the device you want to unpair and select Remove from the pop-up menu that appears.
Then click Apple ID (if you don’t see this, click the red circle in the top-left corner of the window and re-open the app).
Check out our step-by-step guide on how to back up your Mac with Time Machine to find out more. So, it is important that you back up any important data on an external hard drive first.
Or maybe your Mac has been acting sluggish lately and you want to get it working like new. Perhaps you want to sell, trade, recycle, or give it away, and you don’t want your personal information getting into the wrong hands. But the "Scheme" popup menu does not appear in the panel.There are many reasons why you might want to factory reset your Mac computer. If I select the secondary item in that list (Lexar), I can successfully do a format operation. No matter what Scheme I choose, I get an error when trying to format the item higher in the hierarchy in the sidebar to the left (Lexar USB Flash…), as shown in the screen shot above. Mysterious error when formatting higher item The third one ( Apple Partition Map) is for booting old Macs (68K and PowerPC rather than Intel chips). Why is this offered as a scheme for "Mac OS Extended (Journaled)"? That really threw me, and prompted this Question. The second one ( Master Boot Record) is old, from the 80's DOS 2, for old PCs.
Booting is not an issue for my use of this flash drive.
I know the first one ( GUID Partition Map) is for booting modern Macs. When using Disk Utility 16.3 with macOS Sierra to format a "thumbdrive" USB 3 Lexar flash drive (64 gigs), when I choose a Format of ‘Mac OS Extended (Journaled)’, I get a list of three Scheme items: