I think 2TB. Though I have seen only external ones. With on drive do u mean that XP is installed in that drive? If so then I don't think u can do it with an external one.
Internal hdd's I have seen 500GB, don't know if there are bigger ones.
Probably around 800Gigs. I can't be sure. I don't think though that it matters, it will support anything, internally or externall, it just won't be able to Format it or recognise it in the Disk Management.
I think 2TB. Though I have seen only external ones. With on drive do u mean that XP is installed in that drive? If so then I don't think u can do it with an external one.
Newegg. The biggest internal is not 800gb. I had to research on this. Hitachi made the biggest internal hard drive, 500gb. Instead of finding some new technology to add more than 133gb per platter they put 5 100gb platters in it....no new technology but they made the first .5TB internal HD.