Amazon.com: Western Digital 4TB WD Blue 3D NAND Internal PC SSD - SATA III 6 Gb/s, 2.5"/7mm, Up to 560 MB/s - WDS400T2B0A : Electronics
WD Blue 4TB SA510 SATA Internal Solid State Drive SSD - SATA III 6 Gb/s, 2.5"/7mm, Up to 560 MB/s (WDS400T3B0A)
Amazon.com: Western Digital 4TB WD Blue SA510 SATA Internal Solid State Drive SSD - SATA III 6 Gb/s, 2.5"/7mm, Up to 560 MB/s - WDS400T3B0A : Electronics
Amazon.com: Western Digital 4TB WD Blue 3D NAND Internal PC SSD - SATA III 6 Gb/s, 2.5"/7mm, Up to 560 MB/s - WDS400T2B0A : Electronics
Western Digital portable SSD line jumps to a massive 4TB - CNET
WD 4TB Red SA500 SATA III 2.5" Internal NAS SSD WDS400T1R0A B&H