Surveillance class hard drives are made for 24/7 use. They are considered more reliable than desktop drives when the application demands for reliability. Desktop drives are manufactured to run in short bursts of on and off data transmission. Surveillance drives are made to continously record high bandwidth video data around the clock. Algorithms help prevent video loss by making sure frames aren't not lost during high definition video transmission. Aside from being more reliable, they are also built for low power consumption and come with longer warranties. Surveillance drives offer peace of mind for the same cost as desktop drives. For mission critical applications, consider using an enterprise level drive.