Choosing the right partition

[Himym]

Hello, yesterday I installed Ubuntu by selecting the "install side by side option" , so I could dualboot windows+ubuntu. Now i get the error that i dont have any diskspace whenever I try to install a software or save something ,so i decided to select the partitions manually. At the moment, I have an empty E: drive where i would like to save my Ubuntu systemfiles, although the problem is, I dont know which partition that is, since its named like dev\sda ,sda1,sda2 or sdb. How can I tell which one my E: drive is, since two partitions are empty?

[presence1960]

in Windows look at the sizes of your partitions and note them. When you install Ubuntu and get to the Prepare disk space partitioner screen choose manual install, then look at the sizes of the partitions.