ME chest = chest that is part of an Applied Energistics setup. Needs a small amount of power and a storage disk. Really, it's basically just a fancy display apparatus for the contents of the disk.can some one explain the "ME chest" the "locked chest" and "Digital chest" and "black hole chest" please?
Digital Chest = GregTech's answer to the barrel. Not as crazy as the quantum chest, but still pretty big.
Black Hole Chest = holds infinite items (not an infinite amount of 1 item, infinite items). Crafting is disabled by default, but you can cheat it in or change the config to allow it to be constructed.
Not quite sure what a locked chest is unless you're referring to Notch's april fools joke from a few years back. Direwolf20 also spotlighted a mod that adds locks for chests, but I don't think that's what you're talking about.