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AHA!!! I finally got my 810 meg IBM drive to work in the thinkpad. As I mantioned in previous posts, I suspected it had to do with the drive select jumper settings. Well, I removed hd and ohmed out the connector going to the mother board. The two holes on the end are shorted. Checking the jumper settings for the drive, this corresponds to the MASTER setting, i.e., first of 2 drives. There should be NO pins jumpered. How to "unjumper" the 2 end pins? Clip off one of the pins? No...too risky, what if it didn't work. The leads of the connector are soldered to the underside of the circuit board. So I removed the pcb, and using a VERY fine soldering tip (one made for surface mount work), I lifted one of the leads. Put it back together and VIOLA! BTW, the hd pcb is fastened to the aluminum casting with very small torx screws. Fortunately a regular hex wrench (of the right size) worked ok. The screws were VERY tight. I suspect the problem with the WD AL2540 drive may be the same. A WD tech gaveme the jumper settings for that drive and they are the same. Also, he said that Segueshould have a software fix thay may address this problem, but the folks at segue didn't know anything about it, though "they are checking". I'm going to load up my new, big hard drive. I feel like I just climbed MtEverest. Best regards, harry seaman