I want to use an old HDD for extra space in my new Mini PC, can anyone tell me how?

I have a new Mini PC with the option of expanding the storage using either a Micro SD card up to 128GB, a USB stick or a USB hard disk or a 2.5 inch SSD/HDD. I wanted to use the 2.5 inch SSD/HDD from my old laptop instead of buying brand new storage. Is there anyway to use the old HDD and just remove the old OS... show more I have a new Mini PC with the option of expanding the storage using either a Micro SD card up to 128GB, a USB stick or a USB hard disk or a 2.5 inch SSD/HDD.
I wanted to use the 2.5 inch SSD/HDD from my old laptop instead of buying brand new storage. Is there anyway to use the old HDD and just remove the old OS (Window7) and keep the photos and documents and not have them be disturbed, broken or erased?
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