Now we have something even simpler than HDD trays : HDD duplicators that don't even need to be connected to a PC, where you place the (naked !) HDDs vertically.

Now we have something even simpler than HDD trays : HDD duplicators that don't even need to be connected to a PC, where you place the (naked !) HDDs vertically. They can also be used as USB HDD hubs, but since the copy button is unprotected, I'm always paranoid to only have one drive in it at once...