additional storage attachment的用法和样例：
- External hard disks can be purchased alone and then attached to the microcomputer with cables; they are used for backing up large amounts of data or for additional storage capacity.
- It also allows customers to retain existing storage devices with no additional storage upgrades or modifications.
- They are used for backing up large amounts of data or for additional storage capacity.
- We love the additional storage, and how we can customize the user interface with our school logo, which gives the product a nice touch for students.