1. Western Digital has introduced the updated WD Blue SN5000 series SSDs, adding a 4TB model to its budget NVMe SSD lineup. 2. The new series features an in-house WD controller, supports PCIe 4.0 x4, and uses a mix of BiCS 5 TLC and BiCS 6 QLC NAND depending on the model. 3. Despite using QLC NAND, the 4TB model is touted to offer better performance and endurance than the lower capacity models.