Volatile write cache
Enabling disk write caching may increase operating system performance. By enabling write caching file system corruption and/or data loss could occur if the machine experiences a power device or system failure and cannot be shutdown properly.
The write cache is usually enabled by default for HDDs, but not always for SSDs.
Write cache reordering
If is disabled, disk write scheduling is executed on a first-in-first-out (FIFO) basis. If is enabled, the disk write scheduling may be reordered by the drive.
Read look-ahead feature
Drives are configured with a feature called Read Look Ahead that keeps the drive reading ahead, even after execution of the current command has completed. The data is retained in the drive buffer to provide a prompt response to a system request if the ensuing
command is indeed sequential.
Read look-ahead is usually enabled by default for HDDs, but not always for SSDs.