The SanDisk Optimus GX C50 Storage Expansion Card adds 512GB of storage to Xbox Series X and Xbox Series S consoles, so you can keep more of your games installed. It is officially licensed for Xbox and plugs directly into the storage expansion slot on the back of the console. An NVMe core built around Xbox Velocity Architecture is designed to match the speed of the console's internal SSD, letting you play Series X|S games straight from the card, and it works with Quick Resume for switching between suspended games. The card measures about 2.18 x 1.24 x 0.3 inches, weighs roughly 25 grams and is covered by a 5-year limited warranty from SanDisk. This is a new, boxed accessory.