The picture above looks like a Samsung USB Hard Drive case right? Looks can be deceiving, the case actually contains come large nuts to make it feel like there is actually something inside and a USB thumb drive to provide some convincing operation. The USB drive has been made to simulate the large hard drive by showing up with a 500GB capacity even though the capacity of the drive is only 128MB. I am thinking some smart people in China made a custom controller for the drive to allow it to work in a loop mode which allows all of the most recent copied data to remain and the oldest data be overwritten. The TOC also works in an interesting way since even though an old file has been overwritten it would remain in the TOC to make it seem that the drive is functioning as it should.