400 MB/s: large video files move in seconds
Samsung says the drive copies a 4 GB file in about 9 seconds, with read speeds of up to 400 MB/s. By Samsung's own count, 512 GB holds up to 24 hours of 4K video, so footage shot on a phone can go to a computer without any cloud service. Real-world speed depends on the port: in a USB 2.0 socket the drive runs slower. According to the manufacturer it survives up to 72 hours in seawater at a depth of one metre.