WD Gold 4TB Enterprise Class Hard Disk Drive - 7200 RPM Class SATA 6 Gb/s 128MB Cache 3.5 Inch - WD4002FYYZ Compatibility : Windows, Windows Server, Linux, and Mac OS Designed for 24x7x365 reliability at workloads up to 550TB per year High level of reliability with up to 2.5 million hours MTBF. Compatibility: Windows, Windows Server, Linux, and Mac OS Performance-optimized for heavy application workloads RAID-specific time-limited error recovery (TLER)