Sorry about that. It must have been a late night when I wrote that guide. It was all backwards. I fixed it.

Thanks for pointing it out.

This article is incorrect. The cache on a hard disk drive is not there to protect data in case of a power loss. It is there to increase performance by providing a very fast, low-latency cache of recently read data. Since the cache is actually faster than reading/writing to the hard drive, bypassing this cache can significantly decrease hard drive performance.

However, disabling the cache will increase safety. If a power loss occurs, all contents of the cache will be lost. Since data may not have been written to the hard drive before the cache was destroyed, data loss may occur if a power outage occurs.