1.->-Click on my computer->; There is a disk management under Management-> Storage. Click it to view your current partition.
2. If you want to expand drive C, you must first separate some space from other disks, select the disk to make room, such as drive D, and right-click drive D->; Select the compressed volume and enter the capacity to be allocated to drive C, assuming it is 30G. You enter 30* 1024=30720MB, and then click OK. After partitioning, you will see an extra 30G of free space.
3. Now right-click drive C, right-click-> Expand Volume, and enter the size, and you're done!
Tips: If it is win7, it is best to leave 50G for drive C, because there are some cache file update systems. Drive C will expand slowly, and leaving more spare space for drive C will also improve the running and processing speed of your computer. Try not to load the software into the C drive, unless it is necessary, regularly cc cclean files and cache files, with 360. I hope my answer can help you solve the problem ~