What are these used for, wish to add additional HD
Those are your hard drive connections. They start at 0 (that would be number 1) and so on making it 4 drives that you can install.
Some boards have many variations, including IDE (older hard connections), so make sure to do your homework by checking what type and versions it supports.
Try reposting with more details on your system, or you could just buy an external drive.
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