View full size image. Measured by surface area, the Caspian Sea is the world's largest inland water body. The sea covers roughly 143,200 square miles (371,000 square kilometers) and borders five countries: Iran, Russia, Kazakhstan, Turkmenistan and Azerbaijan.
A logical device driver is a high level abstraction of how a device behaves. A physical device driver is a driver for a specific piece of hardware. The logical device driver talks to the physical device driver for you to keep you abstracted from the underlying hardware. For example, there are many different types of printers, and they typically come with their own drivers.
A magnetic socket driver is a special socket tool that has a magnetized head. These are drivers designed for metal nuts and are typically used in hard-to-reach areas. The magnetic head holds the nut securely in place while it is inserted onto the bolt. Most automobile carpet and upholstery mechanics use socket drivers.