This is an SSD drive with a 256 GB storage capacity. The form factor is M.2 and it wirelessly connects the hard drive to the motherboard.
From Amazon
ADATA XPG SX8200 Pro 256GB M.2 Gaming Solid State Drive (SSD), black
Neocomputers
ADATA 256GB XPG SX8200 PRO M.2 NVMe SSD, M.2 2280, PCIe, 3D NAND, R/W 3500/1200 MB/s, 220K/290K IOPS