SanDisk Optimus GX Pro 850X 4 TB M.2 PCIe SSD

Expand internal flash storage with a 4,000 GB M.2 PCIe solid-state drive configuration. The SanDisk Optimus GX Pro 850X combines compact M.2 physical integration with PCIe host connectivity, making it relevant where the target system provides an M.2 PCIe storage position. Its 4 TB capacity supports deployments that need substantial local SSD capacity without moving to a separate storage enclosure. M.2 format matters during system selection because the drive installs directly into a compatible internal M.2 slot rather than occupying an external drive bay or cable-connected storage path. PCIe connectivity also requires a platform with an appropriate M.2 PCIe storage interface. Confirm the system's supported M.2 keying, physical module support, PCIe storage compatibility, firmware requirements, and capacity limits before installation. SDSP81400TAN-000E0 identifies the 4,000 GB M.2 PCIe configuration in the Optimus GX Pro 850X range. That combination of capacity, interface, and form factor is the key distinction for matching this drive to a build, replacement, or storage-capacity expansion. It is an internal PCIe SSD option for deployments where an M.2 slot is available and 4 TB of solid-state capacity is required.