I had the drive in my ps3 die, it would feed fine, but wouldn't ever recognize any disks. It was painful to have only demo's to play, but sony sent a box to me & I was able to get a replacement in just a few days. I mistakenly forgot the controller charging cable, so now I have a spare too! Thankfully they didn't hold up my shipment because I neglected to include this oh-so-important cable.
I hoped they'd upgrade me to the new 80gb, but no such luck. I didn't even get a rev. 2 unit, it is rev. 1 like my previous one. I will say that Sony has the replacement process down, and I was REALLY happy they sent a prepaid AIR FREIGHT label to get the dead one back to them. This allowed me to track it to them, and they emailed the tracking for the replacement unit too. All very helpful and useful aspects of their replacement process.
One thing I am VERY dissatisfied with tho [about their replacement policy, is..], my 2 month old ps3 was replaced with a new one, and now I'm stuck with a 90 day warranty on this new one!? HUH!? Yup, it's true the replacements only come with 90day..where is my other 10mos. of warranty?
A repair shop in Canada told me that the drives have an ID in them which has to be set to the ID of the console. You can change this number on the drive by re-burning the firmware, however the tools to do this? Anyways, there may be both a region code, and an ID code that have to match up, for the drive to work on your console. Again, this info came from a repair place up in Canada.