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Chap 01 02
- 3. 1- Figure 1.9 A magnetic disk storage system magnetic coating
- 7. 1- Figure 1.10 Magnetic tape storage
- 9. 1- Figure 1.11 CD storage
- 12. 1- Figure 1.12 Logical records versus physical records on a disk
- 14. 1- Figure 1.13 The message “Hello.” in ASCII
- 18. 1- Figure 1.14 The sound wave represented by the sequence 0, 1.5, 2.0, 1.5, 2.0, 3.0, 4.0, 3.0, 0
Notes de l'éditeur
- Floppy disks – only hold 1.44 MB, but portable
- Delays in electronic circuits are measured in billioneths of a sec; but the physical motion on disks means delays are in thousandths of a sec
- Delays in electronic circuits are measured in billioneths of a sec; but the physical motion on disks means delays are in thousandths of a sec
- Time consuming finding data. Use for archiving
- cds are best for long continous data eg music; if need more random acess -magnetic disk better floppy disk -1.44 MB cds hold 600-700 MB CD – because of uniform linear density, CD has to vary its’ revolution speed – faster when reading inner tracks, slower when reading outer tracks which have more data on them
- Can encode a colour tv program using lum/chrom which can be displayed on both a colour and a black and white tv. If tv is black and white, ignore the red and blue chrominance., just use the luminance