You are a server administrator for your company’s private cloud. To provide service to employees, you are instructed to use reliable hard disks in the server to host a virtual envi- ronment. Which of the following best describes the reliability of hard drives?

The mean time between failures (MTBF) is a measure of the reliability of a system or component. It is the expected amount of time that will elapse between system or device failures. MTTR (mean time to repair) is the average time it takes for a failed device or component to be repaired or replaced. An RPO (recovery point objective) is the period of time a company can tolerate lost data being unrecoverable between backups. ALE (annual loss expectancy) is the product of the annual rate of occurrence (ARO) and the single loss expectancy (SLE).