Which of the following maybe a contributing factor to a higher than average disk failure rate?

A high cache hit ratio is generally beneficial, indicating efficient data access and reducing physical disk operations, which would typically prolong disk life, not shorten it.

Inadequate cooling leads to higher operating temperatures for hard disk drives, which significantly increases the thermal stress on their mechanical and electronic components. This accelerated degradation directly contributes to a higher likelihood of premature disk failure, emphasizing the importance of proper environmental controls.

Non-redundant power can lead to system downtime if a power supply fails, but it does not directly cause individual disk failures, assuming the power supply delivers stable power.

An improper RAID level primarily affects performance, storage capacity, or data redundancy, not the physical failure rate of the individual disks themselves.