The the "150GB" is a data transfer mode and not a capacity limitation.
If you have an SATA 300 drive and your motherboard is SATA 150, then the hard drive needs to be jumpered to 150GB to function properly with the motherboard.
Recently I had my computer opened up and notice my 200GB Western digital SATA drive had pins 5 & 6 "pinned." On the drive legend, it states that NO pins are necessary for either master or slave operation. It further states that with pins 5 & 6 pinned, the drive is restricted to 150GB which Windows say I have.
If I were to remove these pins, would it effect the data on the drive? I would like to have the extra 50GB storage, but only if my presently stored data will be safe.
I'm presently running Vista Ultimate if that makes any difference. Also, if I went back to Win XP Pro, would that make a difference.
I seem to remember that one of the previous editions of Windows had a restriction as to the size the hard drive.