The Western Digital WD_BLACK SN850X 4TB GEN4 internal SSD, a high-performance solid-state drive designed for use with PCs and NAS. NEVER OPENED NEWSSD offers fast read speeds of up to 7300MB/s and a storage capacity of 4TB. It is for improved performance and reliability, and comes with a manufacturer warranty of 5 years. Ideal for expanding storage capacity and also AI cache capability for your own LLM.