100% Working, tested on windows with U.2 to PCIe Adapter PCI-E 4.0 X4 to 2.5 Inch U.2 and QNAP TS-932PX NAS.This drive can be used as an additional disk; it cannot be used as the main disk (C:) in Windows.

The WD SN640 6.4TB SSD NVMe U.2  Ultrastar Solid State Drive is a high-capacity internal SSD designed for PCs. With a sleek black design and a storage capacity of 6.4TB, this drive utilizes NVMe technology for fast data transfer speeds. The 2.5-inch form factor makes it compatible with a wide range of systems, while the Ultrastar product line ensures reliability and performance. Ideal for demanding tasks such as gaming, multimedia editing, and multitasking, this SSD is a top choice for those seeking high storage capacity and quick data access.