Yesterday I went ahead and installed windows since I never know when I will need the computer. I did a 50/80 partition and never saw more than 134GB capacity showing anywhere. I put a version on that included SP2 and many more updates. After loading windows I went into the drive manager and only the two initial partitions showed. Now today I go in there and I see a 170GB free space so I formatted it and I'm in business. All I did was install SP3 and all the updates to current. HDD Health still shows drive capacity at 134GB So I dunno what's up for sure. Seems weird it would be windows because I don't have this problem on my desktop that also gets SP2 to start off and it shows all of my 250GB drive. I guess you are saying the hardware doesn't support 48bit LBA so I wonder why it finally showed up later, strange. I asked Acer and they wouldn't help me without a fee. I checked WD support and they linked to a work around software from Intel but it was for Intel chipsets. Thanks for the reply.