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WorksheetsChapter 3: Storage devices and media (Part 2):
Total questions: 15
Worksheet time: 11mins
How data is stored in CD/DVD disks (Choose two options):
Red laser lights is used to read and write data
stores data in parallel tracks
Uses blue laser to read and write data
Data is stored in ‘pits’ and ‘bumps’ on the spiral track
Difference between Blu-Ray and DVDs (Choose two options):
Smaller ‘pits’ and ‘bumps’ bigger storage , 5 times than DVD
DVD have smaller storage size compared to Blu-ray
Blu-Rays are used for high definition sound track only
Comes with a secure encryption system
Two advantages of Blu-Ray compared to CD/DVD disks:
Very fast data transfer rate
Cheaper
doesn't requires special player
Data access speed is greater than other optical media
Two disadvantages of Blu-Ray compared to CD/DVD disks:
Relatively expensive
Very slow data access times
Read/write operations can be quite noisy
Might have Encryption problems, leading to difficulties to access the data inside the disk
Two advantages of SSD:
Data access is considerably faster than HDD
Cheaper than HDD
More reliable as there are not moving parts
In applications where batch processing is used (e.g.: utility billing)
Two disadvantages of SSD:
longevity, doesn't last long as HDD
Very Expensive compared to HDD
High power consumption
Less reliable
Two other types of portable SSD's:
Pendrive/thumbdrive
Magnetic Strip Card
flash memory Card
RFID based cards
Two advantages of thumb-drives / pen drives:
Cheaper than CD's and DVD's
Doesn’t need additional software to work on most computer
Portable and not affected by magnetic fields
All types of thumb-drives / pen drives have larger storage capacity compared to Blu-ray disks
Two disadvantages of thumb-drives / pen drives:
Easy to lose
Encryption problems
Need to be careful when removing a memory stick from a computer
Superseded by newer technologies
Two use of thumbdrives/pen drives:
Transporting files between computers
Used only for burn high definition movies
Used for audio/music only
Security device to prevent software piracy (dongle)
Advantage of SSD:
Lower power consumption and cheaper
Run much cooler than HDDs and usually much larger storage space compared to HDD within the same price range
Much Faster than HDD and No moving parts
Lower power consumption and used primarily as backup storage
Two disadvantages of SSD:
Last less than HDD if more frequent read/write operations are performed
Uses a lot of power
More expensive than HDD
Bulky and thick in size
Two main use of Flash memory cards
Storing photos on digital cameras
Used only for burn high definition movies
Mobile phone memory cards
used as Security device to prevent software piracy (dongle)
One main advantage of Flash memory cards:
Cheaper than CD's and DVD's
not easy to lose as they are bulky in size
Very compact and can easily removed and used in another device
All types of Flash memory have larger storage capacity compared to Blu-ray disks
Two disadvantages of Flash memory cards:
Expensive per gigabyte
Encryption problems
Lower storage capacity than hard disk
Superseded by newer technologies
