I'm attempting to replace the logic board on a 500GB Hitachi Deskstar hard drive, model HDT725050VLA360 (0A33437BA20290S71). I can't figure out how to disconnect the board from the cable that leads to the inside of the drive. It's a white connector into which four leads (that are soldered to the logic board) enter. I can't figure out if the leads are permanently attached to the connector (meaning I would have to desolder the leads from the logic board) or if that white connector is a socket. It's got tabs of all sorts surrounding it, and if it is a connector, I'm stumped as to what combination of pressure on which tabs would release it. A photo of the connector is at:

http://www.michaelmalak.com/Hitach [...] nector.jpg

Where the cable enters the connector, there should be a sliding lock, push it (very gently and evenly) in the direction of the cable.
There should be a very small grip on either side.

It's locked from both sides. Just get a tiny screwdriver to undo it; I just tried it on a disk of mine and it's really easy.