Safe to upgrade firmware when the dvd drive is an external enclosure?

I just bought a lg 4163, and was wondering if it was safe to upgrade the firmware when the dvd drive is in usb2 external enclosure? thanks for any help.

Some people have reported problems when doing this, others have not. I’m a conservative, do it internally then put it back in the enclosure. May be a slight hassle, but LG usually does about 3-4 firmware upgrades, so it shouldn’t be that bad.