Maximum Partition Size For Windows 7 64bit?

I have a MSI K9N Platinum mainboard with 2-Gig of ram (chosen so that I can over-clock the board if I choose). I have the NVIDIA 570 Chipset with an AM2 AMD Athlon(tm) processor. I had it set up with a 128-Gig partition that I set up when I had Vista Professional (64-bit) installed. A year ago or so I upgraded to Windows 7 Home which worked out much better (even if the mainboard was pre-Windows 7). I installed a PNY Nvidia 210 video board (but am having some trouble getting the driver to work with Windows 7).

My main harddrive is a Maxtor 500-Gig ATA drive that is partitioned with 128-Gig for the C: drive which was the maximum I could use at the time with Vista Pro. I also have a 1TB SATA drive installed for data storage and another 1TB Seagate USB drive for media storage. There is also another 1TB backup drive (Maxtor) connected to my Fios Router.I am having problems with the 500-Gig ATA C: drive - bad sectors or corrupted data. I've isolated most of the data but can't remove it. I need to keep the computer up and working and have wasted enough time with the bad drive.

I want to use the SATA drive installed on the MSI mainboard. Can you tell me what the largest partition size I can have to install Windows 7 Home (assuming I can remove it from my main hard drive on this machine before or after to allow a new installation). I use the primary drive mostly for program installation although Windows 7 generally places all of the libraries on the same drive as a default. If it won't slow me down, I would like to use as much of the 1TB SATA drive as possible. Is there a maximum partition size that I need if I convert the SATA drive to replace the C: drive or boot drive?