Amazon.com: Western Digital 4TB 3.5 Inch SATA III, 7200 RPM, 64 MB Cache Enterprise Hard Drive (Western Digital4000FYYZ) : Electronics
Amazon.com: Seagate BarraCuda Pro 4TB Internal Hard Drive Performance HDD – 3.5 Inch SATA 6 Gb/s 7200 RPM 128MB Cache for Computer Desktop PC, Data Recovery (ST4000DM006) : Electronics
WD Black 4TB Performance Desktop Hard Drive 7200 RPM - Newegg.com
TOSHIBA 4TB 7200 RPM 3.5" Enterprise Hard Drive - Newegg.com
Amazon.com: Wd Re Wd4000fyyz 4 Tb 3.5" Internal Hard Drive . Sata . 7200 Rpm . 64 Mb Buffer "Product Type: Storage Drives/Hard Drives/Solid State Drives" : Electronics
MaxDigitalData MD4000GSA6472DVR 4TB 7200RPM 64MB Cache SATA III (6.0Gb/s) (Surveillance Storage) 3.5" Internal Hard
Amazon.com: MaxDigital 4TB 7200RPM 64MB Cache SATA III 6.0Gb/s (Enterprise Storage) 3.5" Internal Hard Drive w/2 Year Warranty : Electronics
Amazon.com: HP 695842-001 4TB SAS Hard Drive Disk (HDD) - 7,200 RPM, 3.5-inch form factor, SmartDrive Carier (SC), Midline (MDL), 6Gb per second Transfer Rate (TR) : Electronics