Delete everything on two hard drives

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Hi I just got my new computer and I'm newbie. I connected my old hdd in to SATAR and it works but the this disk, should be clean and be free for storage of files. My computer runs windows 7 from the main hdd and on the second hdd there is a windows xp on it.

My question is if I could delete every folder on 2 hdd exactly every single files but not my photos, would this hdd still work if i deleted the windows stuffs? Or i need to format it ?
 
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