WD Black WD4005FZBX - Hard drive - 4 TB - internal - 3.5" - SATA 6Gb/s - 7200 rpm - buffer: 256 MB - Hunt Office UK
Seagate SkyHawk ST4000VX007 4 TB Hard Drive - Internal - SATA (SATA/600) | eBay
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Seagate Barracuda 4 TB Internal Hard Drive HDD – 8.89 cm (3.5 Inch) SATA 6 Gb/s 5400 RPM 256 MB Cache for Computer Desktop PC (ST4000DM004) - Computer Mega Mart