You have just heard about how to access Hard Drive from mobile,of course it's true. You can access hard drive partitions from your Android mobile,for this you don't need to download bulky software. If you have ES File Explorer,it's enough to access files from hard drive. Download ES File Explorer in your mobile.Then open it and move to settings,select LAN.

Before moving to LAN, you need to open your My Computer and then select a drive which you want to be share on your mobile. Right click on selected drive and then

Properties>Sharing>Advance Sharing>Share this folder

 Now open ES File Explorer


But in between you have to sign in with your PC's Username and Password.