I'm thinking about getting a SSD for my Dell Vostro 3550 laptop. It's about 1.5 years old. A few questions:

Can I tell what speed the SATA controller can operate at? Current HD is 3.0Gb/s. (According to "sudo hdparm -I /dev/sda", the current HDD supports Gen 1 and Gen 2 speeds (1.5 and 3.0 Gb/s.)

Will the new 7.5mm SDD's fit in a 9mm 'slot'?

Anything particular in the SSD I should look for to insure it supports Ubuntu and multi OS boot?