Hey, Tom's Hardware Forum. I have a problem. I’m missing over 100gb on my C drive and I have no idea why. According to Windows Explorer, about 270gb is taken up in files and yet I only have about 70gb free. The total drive capacity is 455gb!
The Dell recovery partition is only 10gb in size. Also, I've run chkdsk and it did not solve the problem. I'm using Win 7.
Ahh good point, could very well be system restore. If you right click on your local disk in question and go to properties, then disk cleanup.. once it's done working out what you can remove there is a tab for "more options". From that tab, there is an option to delete all but most recent restore point and this can save you no end of space. Then as sub mesa has said, limit the system restore to say 5% of your total space to stop it doing this again.
Once you run Disk Cleanup it should give you a list of what can be removed. Up at the top there is a tab called "more options" or "advanced" or something like that. On that page, there is the option to remove old restore points.
And yes.. system restore can take up to 100% of your disk space unless configured otherwise. I believe by default this should be at 10%, but that's not always the case.
I've removed 40GB of system restore points before.
Remember to use tools like CCleaner also to remove temp files and temp internet files.. I've gathered up to 20GB of temp files before.