If you bought a USB to IDE cable, you've got the wrong cable. You need a USB to SATA cable.
As far as installing the 400GB into the PS3, no need to really do anything before hand... even if you format it from your PC, you'll still need to format it with the PS3 so that it can also install the software. Either way though, you should be able to use the quick format which if I remember right, really didn't take all that much time (less than 10 minutes maybe?).

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