Date: Lesson Meeting people Lesson materials appendix lead in activity

Make up sentences with the new words in Appendix 2 using Help Box expressions
1. Storage devices can be divided into 3 categories: magnetic, optical and flash memory.

2. Most PCs consist of one internal hard disk.

3. External storage devices include external hard disks and memory sticks.

4. There are two types of computer memory: primary and secondary.

5. Optical drives are classified into 3 categories: CDs, DVDs and BLU-RAY disks.

6. Magnetic storage device include hard disks and floppy disks.
APPENDIX 4. (1) VIDEO (2) TEXT
Watch a video and make notes about storage devices
Earlier version of storage devices were punched cards made of paper.

Magnetic storage devices include hard disks and floppy disks.

Optical storage devices include CDs, DVDs and BLU-RAY disks.

Flash storage device include USB flash drives, memory cards, SD cards and etc.

Primary memory(or internal memory) accessed directly by CPU.

Secondary memory(or external memory) is backup memory used for long-term storage of data. It is slower than the primary memory.