118000423 – EMC 4TB 7200 RPM SAS 3.5″ HDD for Unity 300, 400, 500, 600 series 15 bay enclosures – Disk Drive Finder
WD Re 4TB Datacenter Hard Drive 7200 RPM 3.5" - Newegg.com
HP 4TB 7200 rpm SAS-2 3.5" Internal SC Midline Hard 695510-B21
WD Red Pro 4TB 7200 RPM 3.5" Internal Hard Drive - Newegg.com
ST4000NXCLAR4000 – Data Domain 4TB 7200 RPM SAS 3.5″ HDD for Data Domain ES30 15 bay enclosure – Disk Drive Finder
WD Black 4TB Performance Desktop Hard Disk Drive - 7200 RPM SATA 6 Gb/s 128MB Cache 3.5 Inch - WD4004FZWX - Walmart.com
TOSHIBA X300 HDWR440XZSTA 4TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Desktop Internal Hard Drive Retail Packaging - Newegg.com
HP - Smart Buy - 4 TB - SATA 6Gb/s - 7200 rpm - Hard drive
Amazon.com: WD 4TB 3.5 Inch SATA III, 7200 RPM, 64 MB Cache Enterprise Hard Drive (WD4000FYYZ) (Renewed) : Electronics
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Seagate Exos 7E8 ST4000NM002A 4TB 7200 RPM 256MB Cache SATA 6.0Gb/s 3.5" Internal Hard Drive - Newegg.com
Amazon.com: Western Digital RE WD4000FYYZ 4TB 7200 RPM 64MB Cache SATA 6.0Gb/s 3.5in Enterprise Internal Hard Drive - OEM w/3 Year Warranty (Renewed) : Electronics
Amazon.com: WD Red Pro 4TB NAS Hard Disk Drive - 7200 RPM SATA 6 Gb/s 64MB Cache 3.5 Inch - WD4001FFSX : Electronics