I got a new 1.5TB Drive, and had problems formatting it. Running Windows Vista 64, HP Pavilion, AMD Quad Core.
Apparently the problem is with the nvdia chipset - the hp technician was able to give me the solution.
Mark : Larry, while researching I found that this is a known issue with Nvidia chipset.
Mark : They wont format the hard drive whose capacity is more then 1.1 TB.
Mark : This issue could be resolved by downloading and installing latest chipset drivers.
Mark : Larry, we have to download original latest chipset drivers that to from manufacturer that is from Nvidia website.
Mark : Please click on the below link and confirm me if you are in page with title "1.5TB (ST31500341AS) or larger SATA hard drive only showing 1.1TB capacity in Windows Vista "
Note: The above-mentioned URL will take you to a non-HP Web site. HP does not control and is not responsible for information outside of the HP Web site.
Mark : Though the article is related to seagate hard drive but the issue and resolution is common for all the nvidia chipsets.
Mark : Good, just for your clarification go through the information you will have a clear idea about the issue that you are facing.
Mark : Now I will provide you a link from where we can download and install the latest chipset drivers.
Mark : Please click on the below link and confirm me if you are in page with title "nForce Driver"
Mark : After restarting connect the hard drive and format it.
Mark : By this time the issue that you are facing will be resolved.