For that specific information you will need to contact them about what the HDD manufacture is.
http://www.cyberpowerpc.com/company/contact.asp
As for adding another HDD to the system yep its easy just like any other PC.
It is always easy to add another HDD but I can't find any info about its HDD
Hard Drive 500GB SATA-II 3.0Gb/s 7200RPM HDD
http://www.cyberpowerpc.com/system/Gamer_Ultra_7000_Elite/
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