Hi @pearson1977 , the life expectancy of an HDD can vary quite a bit, anywhere from 3 to 10 years usually, with the average lifespan usually landing in the middle somewhere. It's actually very rare we get a ZEN MkII back with HDD issues which is a good result since those devices are now 8 to 10 years old depending on date of purchase. But drives will ultimately fail which is why we strongly recommend keeping an up to date backup.