RE: SSD disk upgrade - compatibility with Latitude E6420 - E6430
I upgraded me E6440 with a Samsung 850 PRO SSD 512GB. I took the standard 320GB out and swapped it with the SSD after I ran Samsung Magician. There was no BIOS change necessary. Whatever the defaults that come delivered with Dell will be fine to use with the HDD or SSD (when you clone the HDD to it).