4TB, 8 GB NAND Flash, SATA 6 Gb/s, 3.5", Cache 64 MB
Western Digital WD Blue 4TB, 4 TB, 64 MB, 3.5", Serial ATA III
Western Digital WD Blue 4TB. Hard drive capacity: 4 TB, Storage drive buffer size: 64 MB, Hard drive size: 3.5", Host interface: Serial ATA III, Hybrid-HDD cache memory: 8 GB