WD Blue 4TB 3.5" Internal Desktop Hard DriveWD BLUE 3. 5IN PC HARD DRIVE 4TB [WD40EZAX] WD Blue internal hard drives deliver reliability for office and web applications. They are ideal for use as primary drives in desktop PCs and for office applications. With a range of capacities and cache sizes, theres a WD Blue internal hard drive thats just right for you.+ Durable Design This drive is built to withstand shock and vibrations, ensuring reliable performance during heavy use. Fast Data Transfer