Showing low internal storage in Sony Xperia T2 Ultra when connected to PC

I am proud owner of Sony Xperia t2 ultra and I am not using any SD card but I am facing a problem that it shows lesser internal space when connected to computer but in real it has more space left. My phone has around 2.5GB internal space left when I check from phone but if I connect to computer then it shows only 1.8 GB space available.

Now I can't copy big files in it when no space is left, where is my rest of the space which is shown in phone but not in computer ?

Hi Yash, it could be cache in your phone, the phone may not be counting cache files while for computer they are there, though I am not sure but that's the best guess I can give here, you may delete your cache files using some application like ES taskmanager (its actually lot more than that) and then see what computer says.