Booting a USB3 external drive via TB3 port?

[imacken]

Just for the hell of it, I tried booting into Windows connecting my USB3 SSD into a TB3 port via a USB to USB-C adaptor. The drive was recognised OK, and the Windows logo appeared OK. However, just before getting to the login screen, my iMac just restarts.
Is this something that should work OK?

 

[imacken]

No one?

 

[Truefan31]

i don't see why it wouldn't work....maybe some update is needed

 

[imacken]

Thanks. Update for what?

 

[ColdCase]

Is another mac able to boot from the USB3 disk?

 

[imacken]

I haven’t got another Mac with a TB3 port.

 

[ColdCase]

What about a USB port, but I guess you boot your other mac via USB... never mind, sorry.

 

[imacken]

Sorry, I guess I’m not making myself clear. I have no problems booting from the drive via a USB3 port. I just tried the TB3 port via USB-C cable for the hell of it to see if the transfer rate would be any different.
As I said, it starts booting Windows, but when it gets to go to the login screen, it just stops and shuts down my iMac.

 

[ColdCase]

Your windows is at lease 10,8.1?

 

[imacken]

Yes, Windows 10.