Magnetic: Portable Drives

Completely external, portable hard drives are quickly becoming popular, due in a great part toUSBtechnology. These units, like the ones inside a typical PC, have the drive mechanism and the media all in one sealed case. The drive connects to the PC via USB cable and, after the driver software is installed the first time, is automatically listed by Windows as an available drive.

Another type of portable hard drive is called amicrodrive. These tiny hard drives are built intoPCMCIA cardsthat can be plugged into any device with a PCMCIA slot, such as alaptop computer.

**This microdrive holds 340 MB and is about the size of a matchbox.**
Photo courtesy Iomega Corporation

You can read more about magnetic storage inHow Hard Disks Workand录音机是如何工作的. To learn about optical storage technology, check out the next page.