how to see the hidden folder from an external drive connected to mac

If the 'hidden folder' is the same as the 'recovery partition', start your MBP holding down the OPTION key.

Ciao.

There shouldn't be any hidden folder on an external drive. There may be some hidden files but those are system files placed there by the OS and really don't need to be seen as you can't and shouldn't do anything with them. If you delete them the system will just recreate them.

But to show all files on every drive connected in any way to your Mac open terminal and type this in and hit the enter key.

defaults write com.apple.Finder AppleShowAllFiles YES

To stop showing all just change the YES to NO

greetings again to Orgelthorpe and Shootist from Pavlov. For once I have my old photo in here.