Computer Studies GCSE by Graham Taylor (auth.)

By Graham Taylor (auth.)

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Sample text

When the access arms are moved across all the read/write heads are moved together so that each head is positioned over the same track of each recording surface. • The set of tracks under the heads forms a vertical cylinder (see Fig. 4) and, if related records are all stored on the same cylinder, they can be accessed without moving the access assembly. This is called the cylinder concept. • A record may be accessed directly by specifying the cylinder, track and sector number, as in Fig. 5. The heads move to the appropriate track, then remain stationary whilst the disk spins round to the required sector.

I~ I - I I I : , I Forward and reverse dr ive capstans I I I I I I I I \ The Advantages and Disadvantages of Magnetic Tape Pick up reel 1 I Fig. 3 shows a reel-to-reel magnetic tape drive unit as is typically used in mainframe and mini-based computer systems. Data is read from or written to magnetic tape using a tape drive. e. e. destroys previous contents) heads. The vacuums help to ensure that the tape moves at a steady speed by sucking up the slack, thereby limiting breakages. -- ~ 1 Reel-to-reel Magnetic Tape I '-- / I \ ....

There is a burglar alarm system wired up using the following logic diagram. door 1 door 2 window 1 window 2 (a) Explain the purpose of the logic in the diagram (assume that doors or windows being open and the alarm sounding are represented by a logical 1) (b) The logic gate labelled X is changed to an AND gate. Write down what effect this has. 12 A mainframe computer is to be controlled automatically by a logic network. There are three binary signals available which have the following values under the given conditions.

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