Storage · Western Digital

Western Digital WD Black SN850X 4TB

Western Digital WD Black SN850X 4TB for local AI desktops and workstations that need fast checkpoint loading and room for large model files.

Western Digital WD Black SN850X 4TB is a NVMe Gen4 SSD product from Western Digital built for desktop and workstation systems that run local AI workloads. It suits model loading, dataset handling and daily creation work where fast checkpoint loading and room for large model files matters in a home lab or office build.

Specifications

Name	Western Digital WD Black SN850X 4TB
Brand	Western Digital
Category	Storage
Type	NVMe Gen4 SSD
Storage	4 TB
Key spec	Interface PCIe Gen4 x4 NVMe
Key spec	Read up to 7300 MB/s
Key spec	Endurance 2400 TBW
Key spec	Form factor M.2 2280
Best for	LLM inference; model storage; dataset storage
Specs source	Western Digital product page
Last verified	2026-11-14