You may buy the iPod for its music-playing capability, but it’s also a great portable data storage device and can be mounted on the desktop just like any hard drive. To protect your important data, TechTool Pro maker Micromat Inc. has introduced PodLock, a new utility that hides important files by creating an “invisible” password-protected data partition on the iPod. It can also unfragment file data on the iPod, which Micromat claims improves file retrieval and music access speed. PodLock can backup and restore data on the primary iPod volume, manages pictures and voice recording, and displays technical info about the iPod as well. Its suggested retail price is US$65, and a functional demo is available.