SAS, SATA, SSD - what to choose (server)?

Question

Hard disks

3 variants of SAS, SATA, SSD - what, in fact, is the difference, and what will it affect, except for the pocket?

Answer 1

SAS and SATA are interfaces between the drive and the server motherboard. I, perhaps, will refer to the profile answer from "similar questions": What is the SAS show-off?
SSD or HDD - the first is fast, but either expensive or small capacity, the second is a lot of cheap space, but slow.

Answer 2

well, if you want speed, then you need to take an ssd sas disk

Answer 3

If you need to store a lot - only SATA (for the server)