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I've gotten a lot of questions about the Sigma Data hard drives, so I'm posting the information to the mailing list: Sigma Data is at least one of the OEM manufacturers of the hard drives shipping in the 355, 360, and 75x series. Therefore these drives have the exact same specifications as the original IBM drives. IBM fully supports these drives, including maintaining them under the terms of the ThinkPad warranty. Since they are the OEM manufacturer, the drives come in the same case, same connector, etc. The only difference is that there is a Sigma Data label on the case... Here are the part numbers: Capacity IBM Part Number Sigma Data Part Number 340M 66G2849 QED/TP750-340 540M 84G2150 QED/TP750-540 810M 84G8250 QED/TP750-810 Sigma Data 17 Newport Road New London, NH 03257-4567 (800) 446-4525 (603) 526-6909 Robert George (george@cs.nps.navy.mil)