Information and Communication Technology: Storage Devices and Media Quiz

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What is the reason Blu-ray discs can store up to five times more data than normal DVDs?

They use a sandwich of two 0.6 mm thick disks (correct)
They come with a secure encryption system
They have a slower data transfer rate
They use a thicker polycarbonate disk

How does the data transfer rate of a Blu-ray disc compare to that of a DVD?

DVD and Blu-ray have the same data transfer rate
Blu-ray has a faster data transfer rate (correct)
Data transfer rate is not mentioned in the text
Blu-ray has a slower data transfer rate

Why do Blu-ray discs automatically come with a secure encryption system?

To prevent piracy and copyright infringement (correct)
To make the disc thicker
To increase the data transfer rate
To reduce the storage capacity of the disc

How many hours of high definition movies can be stored on a dual-layer Blu-ray disc?

4.5 hours (B) Signup and view all the answers

What is the storage capacity of a single-layer Blu-ray disc?

27 GB (D) Signup and view all the answers

How does the thickness of single-layer Blu-ray discs compare to that of normal DVDs?

Both use a 1.2 mm thick disk (C) Signup and view all the answers

What type of head in the optical drive moves to the start of the track when the disk spins?

Optical head (C) Signup and view all the answers

How are CDs/DVDs different from HDDs in terms of data access?

CDs/DVDs store data in sectors, unlike HDDs. (D) Signup and view all the answers

What is the depth of the pits where data is stored on a CD/DVD compared to the wavelength of the laser light used?

About 20% of the wavelength (B) Signup and view all the answers

Why is a red laser used to read and write data on a CD/DVD?

To match the original laser wavelength (A) Signup and view all the answers

What happens to the wavelength of reflected laser light compared to the original laser light when reading CD/DVD discs?

It slightly changes causing destructive interference (A) Signup and view all the answers

What is a major disadvantage of CD-R and DVD-R?

Cannot be recorded over if an error occurs (B) Signup and view all the answers

In what aspect are CD-RW and DVD-RW less wasteful than CD-R/DVD-R?

Files/data can be added at a later stage (C) Signup and view all the answers

What is a common use of CD-RW and DVD-RW?

Backing up files and data (A) Signup and view all the answers

Why are CD-ROM and DVD-ROM classified as read-only memory?

They can only be read and not written over (C) Signup and view all the answers

What is a disadvantage of CD-RW and DVD-RW in terms of data security?

Possible to accidentally overwrite data (A) Signup and view all the answers

How do CD-RW and DVD-RW differ from CD-R and DVD-R in terms of reuse?

CD-R/DVD-R can be recorded over many times (B) Signup and view all the answers

What is a unique feature of Blu-ray discs that distinguishes them from DVDs?

Six-layer technology for increased storage capacity (C) Signup and view all the answers

Which optical media technology has the smallest track pitch among CD, DVD, and Blu-ray?

DVD (A) Signup and view all the answers

What is a major advantage of using Blu-ray discs for data storage?

Fast data access speed (B) Signup and view all the answers

Why might the introduction of HD DVD players reduce the advantages of using Blu-ray discs?

HD DVD players have limited storage capacity compared to Blu-ray (B) Signup and view all the answers

Which device can use Blu-ray technology for backing up hard drives?

Computers (C) Signup and view all the answers

What is a disadvantage associated with using Blu-ray discs for storing video content?

Possible encryption problems related to piracy prevention (C) Signup and view all the answers

What is the advantage of magnetic tape over hard disk drives (HDDs)?

No need to read all the previous data before accessing the required data (C) Signup and view all the answers

What is the main disadvantage of magnetic tape storage?

Affected by magnetic fields resulting in data corruption (A) Signup and view all the answers

How do hard disk drives (HDDs) differ from magnetic tape drives in terms of data access?

Data is read directly without needing to read earlier data first (B) Signup and view all the answers

What is the main advantage of portable hard disk drives over fixed hard disk drives?

Can be used to transfer files between computers (C) Signup and view all the answers

Which statement about optical media is true?

Relies on the properties of laser light for reading and writing data (A) Signup and view all the answers

Why are magnetic tapes still used in large industrial or university computers?

To store huge amounts of data at a lower cost per byte (C) Signup and view all the answers

What feature of hard disk drives allows them to have faster data access times compared to magnetic tape drives?

Direct access to required data without reading earlier data (D) Signup and view all the answers

Which device uses concentric circular tracks and sectors for storing data?

Hard disk drives (HDDs) (B) Signup and view all the answers

Why are magnetic tapes considered ideal for long-term archiving of data?

Because they have huge storage capacities and stability over time (D) Signup and view all the answers

Which statement accurately describes the file allocation table (FAT) in hard disk drives?

Helps locate free sectors when storing new data on HDDs. (B) Signup and view all the answers

Blu-ray storage capacity

Blu-ray discs can store significantly more data than DVDs, roughly five times more.

Blu-ray data transfer rate

Blu-ray discs have a faster data transfer rate than DVDs.