DESC: The Latitude C640--a refresh of another Dell business-focused laptop, the Latitude C610--has a modular bay located conveniently on the front that can hold an optical drive (in this instance, a DVD-ROM/CD-RW combination drive) or the included floppy drive. Optionally, it can hold an extra-cost secondary power pack for stretching the already-good 3-hour battery life. With the optical drive inserted into the bay (and not including the power adapter or the external floppy drive), the Latitude C640 weighs just 6.1 pounds.