I actually want to have a hard drive storage device where it can accommodate a number of hard drives at the same time, but it looks like something a little out of my budget, so I don't want to buy it now but the HDD slots on my chassis is already full. I 'd like to buy an external desktop 3.5 HDD instead which is seal and ready for immediate use after plugging into the power cord. I'd like to know if I can break the case of the external HDD and take out the 3.5 HDD inside later?? Is it difficult and dangerous??