Toshiba BG4 512GB NVMe SSD (M.2 2230)
Details from the label:
Brand/Model: Toshiba KBG40ZNS512G
Capacity: 512GB
Interface: PCIe Gen3 x4 NVMe
Form factor: M.2 2230 (22×30 mm, single-sided, DRAM-less)
Dell OEM part (DP/N 08C3CP), made in Taiwan
Label date: May 2019
Health: 97%
Typical performance (BG4 series): up to about 2,250 MB/s read and 1,700 MB/s write.
Compatible with: Steam Deck, ASUS ROG Ally, Surface Pro/Laptop, and many compact Dell/Lenovo/HP laptops with a 2230 slot. It is not compatible with standard M.2 2280 slots without an adapter.