I am looking for a 2.5" HDD, with so many different options i'm confused. My computer has a sata II but i might put the drive in a external enclosure and use thru e SATA. This were some suggestions a friend gave me. money is not reallly as issue.
For regular use just got any size HD in size you want 7200k RPM are faster.
Depending on enclosure you use, 5400RPM drive will be better. (less heat so it won't fry)
SATA II is same as (sata, sata 3, eSata) it will work inside enclosure.
And forget about Enterprise 10k HDD, its waste it meant to be on 24/7 (and other server features) for that $$$ just get SSD Drive. Thou you have to make up your mind for what use exactly your want it.