can I use windows 7 professional 64 bit with 8TB internal hard drive..i lost 8 tb files from nas raid am restoring it..please confirm so i can purchase
If you want to boot Windows 7 from a drive that large, you'll have to install Windows in UEFI mode, otherwise it will operate perfectly fine as a secondary drive.
Yes I am sure, there's nothing wrong with any capacity drive running windows on it, although personally even for a server you can get an SSD for the OS.