Difference Between Philips 1620K & Philips 1625k

Whats the difference between the Philips 1620K and 1625k is it just a firmware difference or are they completly different drives.

Firmware difference… 1620K has P2.x firmware… 1625K has P3.x firmware. You can upgrade 1620K with P3.x firmware without a problem an you won’t void the warranty.