I got a difficult one for you today. I got a VGN-TXN25N VAIO Laptop with an 80GB 1.8" HDD!!! Please pay attention, NOT 2.5" but 1.8" HDD. I got the message 0200: Failure Fixed Disk 0 on the BIOS boot-up and after a lot of efforts to solve this problem, I decided replacing the HDD with a new one (120GB this time). Again the same problem persisted! I sent the laptop to a SONY Service center, the same service center that provided me with the new HDD and asked them to have a look at it. The technician there told me that the new HDD might have been faulty, contacted the manufacturer and got a new HDD to replace it. After the 2nd replacement the laptop worked fine (as I was told) and the technician installed back the Vista. I asked him to remove it (format it) cause I owned Windows 7 Ultimate and wanted to install them on my laptop. When I got the laptop back (with no additional charge since they told me it was their fault to provide me with a faulty HDD), the same error popped-up again as soon as I turned it on. If you go into BIOS (Phoenix) setup, you can see the HDD there but you can’t see it when you try to load Windows 7 (or even XP SP3). Let me indicate here that this HDD has a 4KB memory and is a PATA one (IDE). I don’t know if that tells you anything but as I was told, I shouldn’t mess with that memory (and I didn’t)! The DVD-RW which is connected on the same cable works fine. NO BIOS update from SONY's webpage and no drivers for the HDD since it's an IDE one. Any suggestions on how I should proceed?