General questions regarding storage

I have 16 HD cams, 3mp, 15fps recording 24/7 on 2 3TB external harddisks with USB 3.

Working fine,
Cor
 
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That Seagate external drive would work fine, if you had a USB 3.0 or 3.1 port to plug it into. Looking closely at your Dell, that's not likely. I see IDE or floppy ribbon cable; I see a parallel port (!); and I see PCI (along with the PCI-express) slots. That machine is not likely to have USB 3.0 or newer. Still, check for a blue USB port. If you have one, just buy the external drive.
 
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