This chapter introduces data storage management on volumes formatted with NT file system (NTFS). You will learn about compression, which allows you to store more data on a disk, and you will learn about disk quotas, which allow you to control how much space a user can use on a disk. You will learn how you can increase the security of files and folders on your computer by using the Microsoft Encrypting File System (EFS). You will also learn about defragmenting a disk, which allows your system to access and save files and folders more efficiently. To complete this chapter, you must have