Now, 25MB isn’t a lot of space. If you need more, look at TrueCrypt. With it you can create a larger container. Or you can encrypt an entire hard drive partition. It’s a powerful program, so read this tip for help.
You could also password-protect files and folders. The repair techs would not be able to read the contents without the password. You can learn exactly how to do it in this tip.
Back it up
The most important thing you need to do before taking your computer in for repair is to make a backup of your important files. Frankly, the repair folks don’t care as much about your data as you do. You never know what could happen. Files are too easy to erase and hard drives do fail.