Before internal storage became the norm, Sega blazed a trail with the Dreamcast Visual Memory Unit, a pocket-sized device which not only stored all of your game progress but also doubled as a tiny handheld game console.

One of the Dreamcast’s more unique features, the VMU felt like a genuine innovation – but it had some serious shortcomings. Storage space wasn’t great, which meant that serious collectors would either need to delete progress to free up space or invest in multiple VMUs.

Another drawback was that the internal CR2032 batteries didn’t last all that long and weren’t rechargeable, which led to the annoying ‘beep’ sound whenever you turned on your console with a ‘dead’ VMU inserted into the controller. Many serious Sega fans have this abrasive, discordant noise etched into their psyche.