Msata is an interface. SSD is a solid state hard disk

Solid state storage technology, referred to as SSD. can generally be divided into two types, one is the SSD: flash memory using FLASH MEMORY as the storage medium which is usually based on the common SSD, U disk is often used, digital cameras and other electronic memory and some ATA, SCSI, FC connection Flash Disk, referred to as flash disk.

The SSD interface can be msata, SATA, PATA, USB, eSATA... The speed of contrast is meaningless. Whether it is Caching (understood to add a super large memory) or Boot (Understanding RAID), the fast startup is pure SSD. If the program on HDD is started fast, caching will be better.