Western Digital NAS WD40EFAX 4TB SATA 6GB/S WD Red NAS Only 3,823 Hours. Manufacturers Date 3/23/20

Expected Operating Lifespan Typically 3 to 5 years of continuous 24/7 use (approximately 26,000 to 43,000 power-on hours). Many users report these drives running well past 50,000 hour s