最近思考是否幫新筆電加mSATA，看了NB's User Guide：

Note: If your computer is equipped with both a hard disk drive and an mSATA solid state drive, you are not recommended to use the mSATA solid state drive as a bootable device. The mSATA solid state drive is designed and developed for the “cache” function purpose only. If you use the mSATA solid state drive as a bootable device, its reliability is not guaranteed.

現在看到加mSATA幾乎是裝系統當開機碟用，
怎麼User Guide不建議mSATA拿來當系統碟用？
現在mSATA的可靠度會不如傳統硬碟？還是mSATA的MTBF不如傳統硬碟？

還有如果將mSATA當cache用，一般是如何設定？
需要特別的軟體來控制？還是從BIOS來設定？