Question: Hi, I am a newbie. My question is that can I install 2 HDDs on my PC. I have an existing hard drive (about 300 GB), can I install a new one, (2 TB 7200 RPM) without replacing my first one?

My Specs:
Motherboard – Gigabyte B85M-HD3-A
CPU: Intel Core I5 4460 3.2 Ghz
RAM: 2×4 GB (1666 mhz)
Graphics Card : Gigabyte RX 560 4 GB OC
PSU: Thermaltake Litepower 450 W

Can anyone help me please? Also if I do can add a new HDD, would it be harmful for PC, like not providing enough power?
Thanks in Advanced.

Answer:Your motherboard can support 6 sata drives.
What is the make/model of your case?
A very small case may not have the physical space to install a larger 3.5″ conventional HDD.
Otherwise, the power needs of drives are minimal, no problem there.

I might suggest that you look into using a ssd instead,
It will make everything you do much quicker.
And, you could keep your old HDD which I might repurpose for External backup.

You can easily replace your current HDD with a 512gb Samsung 860 EVO ssd like this:
https://www.newegg.com/samsung-860-evo-series-500gb/p/N82E16820147674?&quicklink=true

Or a 1tb samsung 860 QVO ssd like this:
https://www.newegg.com/samsung-860-qvo-series-1tb/p/N82E16820147738