Western Digital predstavil WD Blue SN550 M.2 NVMe SSD



Western Digital unveiled the WD Blue SN550 line of M.2 NVMe SSDs. A successor to the WD Blue SN500, the SN550 is updated with a new controller that utilizes PCI-Express 3.0 x4 (compared to just x2 on the SN500). Designed in-house by WD and SanDisk, the controller is based on the same architecture as the one that drives the WD Black SN750, but is DRAM-less, and has fewer flash channels. Speaking of which, WD deployed 96-layer 3D TLC NAND flash, and wants the drive to compete in pricing with QLC NAND-based drives such as the Crucial P1. The 250 GB variant is priced at USD $54, the 500 GB variant $65, and the 1 TB variant $99.

Vse tri različice izkoristijo povečano pasovno širino PCIe, da ponudijo zaporedne hitrosti branja do 2400 MB / s (SN500 ima največ 1.700 MB / s). Hitrosti zapisovanja so različne, saj različica 250 GB ponuja do 950 MB / s, različica 500 GB do 1.750 MB / s, različica 1 TB pa do 1.950 MB / s. Vrednosti vzdržljivosti (TBW) treh variant so ocenjene na 150 TB za različico 250 GB, 300 TB za 500 GB varianto in 600 TB za varianto 1 TB. Zanimiva izbira dizajna s temi pogoni je potiskanje NAND bliskovnega čipa in krmilnika čim bolj narazen na PCB, za manj koncentracije toplote. Vsi trije modeli so podprti s 5-letnimi garancijami.