What is external hdd case?

An external HDD case is a device that allows users to convert an internal hard disk drive into an external hard disk drive. It is a portable storage device that accommodates and protects the internal hard disk drive and connects it to a computer or other devices through a USB or other interface. External HDD cases are made of aluminum, plastic, or other materials. They vary in size, design, and features, and some models come with cooling fans and encryption features. External HDD cases are an inexpensive way to upgrade storage capacity, backup data, and transport data between devices. They are easy to install and compatible with most operating systems.