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
Dell Constellation ES.3 4TB, SAS, 2.5'' Internal Hard Drive (ST4000NM0023) for sale online | eBay