Samsung 990 PRO 4TB PCIe 4.0 NVMe M.2 SSD. Fully tested and 100% functional - drive health shows 98% (Good status) via CrystalDiskInfo, 364 power-on count, 3106 power-on hours. No critical warnings, no unsafe shutdowns, no media/data integrity errors. Screenshots of the diagnostic report are included in the listing photos. Buyer pays shipping. No trades. Message with any questions before buying.