ICT - Optical Storage Media
Describe 3 advantages of CD-RW's/DVD-RW's
- Be reused - Can be updated - Not as wasteful as the read only format
Use 2 bullet points as to why Blu-ray discs can store more data than other types of optical media
- Because they can read data dots positioned closer together - Blue dye can hold more data than other colours
Describe 3 advantages of DVD-RAM discs
- Can be written over 100,000 times - Very large storage capacity - Can read data at the same time that data is being written
Describe 2 disadvantagesDVD-RAM discs
- Expensive compared to DVD recordable discs - Don't work in many devices compared to '-R'
Describe 3 advantages of CD-ROM's / DVD-ROM's
- Hold more data than floppy disc - Less expensive than a hard disc drive - Very portable
Describe 3 disadvantages of CD-ROM's / DVD-ROM's
- Holds less data than hard disk drives - Very slow to transfer and access rates - Cannot add your own files (Read Only Memory)
Describe 2 advantages of Blu-ray discs
- Huge storage capacity - Data can be read/transferred very fast
Describe 3 advantages of CD-R's / DVD-R's
- Impossible to accidently delete because discs become read only - Cheaper than hard disk drives - Easy to transfer information from one computer to another
Describe 3 disadvantages of CD-RW's/DVD-RW's
- More expensive - Possible to overwrite data by mistake - Data transfer is really slow
Describe 3 disadvantages of CD-R's / DVD-R's
- Only recordable once. No updating - If error occurs disc is ruined and must be thrown away - Very slow data transfer rate
Describe 2 uses of CD-R's
- Personalised playlists of music - Transfer data
Describe 2 uses of CD-RW discs
- Personalized playlist of music - Backup of computer files
Describe 2 uses of a DVD-RW's
- Record television programmers - Backup of computer files
List 3 ways how data is stored and read on optical storage media
- Stores data as a number of dots that can be read using a light - Data is read by shining the laser beam onto the surface of the disc - Each dot represents bits of information
Use 3 bullet points to explain the role of disc burner
- To burn data onto a CD/DVD-R - Has more powerful laser compared to a regular disc drive - Disc burner can also read the data held
Describe 2 uses of DVD-R's
- Transfer data - Home recordings of videos
Describe 3 uses of CD-ROM's
- Used by manufacturers to store small files (Eg. Audio books) - Music Tracks - Software
Describe 3 uses of DVD-ROM's
- Used to store bigger files (Eg. Movies) - Modern games (Like Call of Duty) - Multimedia Encyclopaedias
Describe 3 uses of Blu-ray discs
- Used to store high definition videos like movies - Used in home consoles like Xbox - Used to back up hard disk drives
Describe 2 disadvantages of Blu-ray discs
- Very expensive compared to other optical media - Only work in Blu-ray drives/Expensive video players
Describe 3 uses of a DVD-RAM disc
- Video and Data archiving - Recording of TV programs - Using in camcorders to store videos
How many time can '-RW' discs be reused
1000 times
What is the storage capacity of a Blu-ray disc
25GB, 50GB, 100GB
What is the storage capacity of a DVD-R disc
4.7GB
What is the storage capacity of a DVD-RAM disc
4.7GB
What is the storage capacity of a DVD-RW disc
4.7GB
What is the storage capacity fo a DVD-ROM disc
4.7GB (about 2.4 million pages of text)
What is the storage capacity of a CD-R disc
700MB
What is the storage capacity of a CD-RW disc
700MB
What is the storage capacity of a CD-ROM disc
800MB (400,000 pages of data)
Define optical storage media
All the mediums that use a light source to read/write data onto a disc
List the 8 examples of optical storage media
CD-ROM DVD-ROM CD-R DVD-R CD-RW DVD-RW Blu-ray Disc DVD-RAM
Which method of data access does optical storage media use (Direct / Serial)
Direct
Explain what effect 'ROM' discs have on the data they store
It cannot be written over, only read
Explain what effect '-R' discs have on the data they store
Once is has the data recorded it then becomes read only
How many time (approx.) can DVD-RAM discs be over written
Over 10,000 times
What does '-RAM' stand for
Random Access Memory
What does the '-RW' stand for
Re-Writable (rewrite over and over again)
What does ROM stand for
Read only memory
What does '-R' stand for
That the disc was recorable once only
Explain how '-RW' discs allow data to be recorded over and over
The bumps on the bottom of the disc are cleared and are put back differently with the updated data
Explain what effect '-RW' discs have on the data they store
This can be re-written so that you can edit the data
Explain what effect '-RAM' discs have on the data it stores
This means that you can watch the program at the same time that another is being recorded
Explain what is meant by dual layer disc
This means they have 2 layer of a recordable surface which means they can store more data (about 5.8GB more than a regular DVD-R)