A useless thing, like a big one, but large files (movies) cannot be recorded. It seems there is a flash drive, but the film is recorded longer than watching. Pros below: small from the laptop does not really stick out. Bought to expand disk space. Has cons: I formatted it in NTFS not a quick cleanup, but completely, and the speed dropped catastrophically. Reverse formatting doesn't help. The write speed of 5-4 MB is a cap for a 256 GB flash drive