I have owned a Toshiba Satellite L505d laptop running windows 7 for almost 3 years now. Before heading off to college I have been clearing out files and backing them up onto external hard drive. I noticed my computer had used 225gb of the allotted 250gb on my hard drive, but i couldn't find the culprit of what was taking up all that space. I had emptied out the folders i use for image and video files. Program files only accounted for about 25 gb, but when i checked a folder called ATI (assuming the drivers of the video card on my pc) it accounted for 200gb of space. I'm no expert but how could that possibly be? Is it safe to delete this data?