Storage: Buffalo LinkStation Quad NAS server replacement drive

Buffalo LinkStation Quad NAS server replacement drive

I own a Buffalo 1TB NAS I use for media network storage and serving on my Vista Media Center system. The 1TB Buffalo LinkStation Quad has 4 250GB WD Caviar Blue internal drives. I am looking to upgrade this to a 4TB NAS and have a few questions. I would appreicate any help from anyone who may have already done this.

1 - Does anyone know what vendor's drive that Buffalo uses in the 4TB system? They package the drive as a OP-HD1.0T 1TB model. Their price is way too expensive. Does anyone know if they use the WD 1TB Caviar Black configuration? Does it make any difference?

2 - Currently the Linkstation Quad is marketed as a 4TB solution. Does anyone know if the Quad will support internal drives greater that 1 TB?

3- When I do the upgrade I plan on replacing one disk at a time and let the RAID 5 system rebuild the drives. Does anyone know of any other methods...