ADATA SX300 mSATA Overview
The SX300 like all mSATA drives is extremely small. The actual dimensions of the drive are 50.95 x 30 x 4mm(L × W × T). On the front part of the drive there is a sticker that lets us know the part number and the capacity, which is 128GB.
If we remove the sticker we can see the SandForce SF-2281VB2 chip. The B2 on the end means it is the B02 revision of the controller. There are also two flash chips on this side of the drive.
Flipping the drive over there are two more flash chips giving you a total of 4. So that means each chip is 32GB.
Just to give you an idea of how small the drive is below is a shot of the drive next to a normal 2.5-inch solid state drive and a US quarter.