I I have a Nokia Lumia 2520 that I've had since last December. I don't have many apps or really anything saved on it however my hard drive space is only showing 5gb left out of 25gb. I've opened C drive and really everything in it doesn't come close to 20gb. I've already done a disk clean up but that only freed up 30mb. My little brother has a Nokia Lumia 820 phone that did this same thing until the hard drive was completely full and he had to reset the phone to factory settings. Does anyone else know how to fix this issue?