A Level Computer Science OCR Practice Exam

Which type of memory uses patterns of magnetization to represent data?

1. Optical Storage

2. Magnetic Storage

3. Solid State Storage

4. RAM

The correct answer is: Magnetic Storage

Magnetic storage is the correct choice because it utilizes patterns of magnetization on a magnetizable material to store data. This is achieved through the alignment of magnetic domains, which can be magnetized in different directions to represent binary data (0s and 1s). Common examples of magnetic storage devices include hard disk drives (HDDs) and magnetic tape, where data is stored in concentric tracks and sectors. In contrast, optical storage uses lasers and light to read and write data on discs, such as CDs and DVDs, relying on reflective and non-reflective patterns instead of magnetization. Solid State Storage, like SSDs, utilizes flash memory technology that stores data in electronic circuits rather than through magnetic means. RAM (Random Access Memory) is volatile memory used for temporary data storage and does not rely on magnetization; it stores data in semiconductor memory cells. Therefore, the defining characteristic of magnetic storage is its use of magnetization for data representation, making it the appropriate choice.