Pockets for storage devices made of metal and plastic

Metal/plastic

— compromise for "all-rounders": an external or internal enclosure with a plastic shell for ergonomics and an aluminum layer/frame for cooling the controller and memory chips. This format is chosen when a drive has to live both inside a PC case and serve as a portable archive: it is quieter than pure metal but significantly more resistant to overheating than pure plastic—ideal for regular backups, editing projects, and frequent travel.