Activities pg 141

REMEMBER
1. The most common type of RAM used in computers are:
- SDRAM ( Synchronous)
2. EE ( electronically erasable) EEPROM is the most useful of the ROM type of memories as:
- data can be erased by exposing the chip to ultraviolet light.
- new data can be added
3. Optical storage devices store data as light- false

THINK
4. PROM would be an ideal storage device for security data as:
- prevents any alteration of the data
- once the data is added it cannot be changed.
5. Examples of situations where CD-R is a better choice for data storage than CD-RW is:
- For archiving, CD-R will be a better choice/
Note:
-->CD-R ( CD Recordable) technology uses a coloured dye that can be changed by heating to permanently record data.
--> CD-RW ( CD- ReWriteable) technology uses a dye that can be switched betweeen cloudy and transparent.

6. 3.5 inch floppy disks have changed very little since they were first introduced in the mid 1980's- that makes them old technololggy.
 Reasons for their continued popularity include:
- they are still partially compatiable
-" higher density drives are built to read, write and format lower density media without problems, provided the correct media is used."

RESPOND using assess
7. The advantages and disadvantages of flash storage devicesd as replacements for floppy devices are as follows:
Advantages- Flash memory storage devices
- fast and do not require any power to keep data in storage.
- smaller, more compact
- capacity- much bigger
- once data is written into the chip by applying an electric charge to each memory location, its electric charge is trapped and does not need any electric power to be kept there.
- no moving parts, thereby there is no issue of significant danger being done to wipe out or corrupt data in any way.
Advantages- Flash RAM
- uses less power but requires a small electric curren to remember its stored data.
- better suited for small, low power portable devices.
Diadvantages
- higher cost
- contents of an entire flash memory chip can be erased in a single operation.

MAGNETIC FIELDS
- Magnetic
- If on floppy disk, contents can get deleted.