Magnetic ____ such as hard disk drives use ____ fields to magnetise tiny individual sections of a metal spinning disk. Each tiny section represents ____ bit. A magnetised section represents a binary '1' and a demagnetised section represents a binary '0'. These sections are so tiny that disks can contain ____ of data. As the disk is spinning, a ____ head moves across its surface. To write data, the head magnetises or demagnetises a section of the disk that is spinning under it. To read data, the head makes a note of whether the section is magnetised or not. Magnetic devices are fairly ____, ____ in capacity and durable. However, they are susceptible to damage if dropped. They are also vulnerable to magnetic fields. A ____ magnet might possibly erase the data the device holds.

Unit 2 1.2 Magnetic storage devices

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