One of the most common problems users report with high-capacity FDDs is confusion over drive letter assignments. Installing a high-capacity FDD often causes other drive letter assignments to change. The presence of an optical drive such as a DVD writer further complicates matters, and even the decision to boot the system with or without disks in one or another removable drive may cause drive letter changes. In addition, different operating systems handle assigning drives and reassigning drive letters differently. The result is that it's easy to become hopelessly confused about which drive letter corresponds to which drive. How drive letters are assigned is explained in Chapter 13. If you have the opposite problem?your drive isn't assigned a drive letter at all?download and install the most recent drivers for your drive.