SSD data and cache volume on Dell Inspiron

Hi,

I have a Dell Inspiron 15R 7520 and am formatting because it was a little slow.

It has a 1TB HD and a 32gb SSD. When I configure it with Intel Rapid Storage Technology it shows it is using 11gb as data volume and 19gb as cache volume.

I think I remember before formatting that I had all 30gb to cache volume. But now I don`t know which is better. Can you help me with that?

Also, if i'm keeping this data volume, what files should I leave there?

For better understanding, here is a picture of the IRST screen. Is this how it is supposed to look like?