Test on Secondary Storage Devices and Media

Question 1: Hard disk drives offer very large storage capacities.

A. Ano

B. Ne

Explanation: Hard disk drives (HDDs) are noted for having very large storage capacities, which is listed as an advantage in the study materials.

Question 2: Which of the following are the main uses of portable hard disk drives?

A. Backing up files for long-term storage or archiving

B. Allowing data to be transferred between computers

C. Acting as a security device (dongle)

D. Storing photos on digital cameras

Explanation: The study materials state that the main use of portable hard disk drives is backing up data and to allow data to be transferred between computers. Acting as a security device (dongle) is a use for pen drives, and storing photos on digital cameras is a use for memory cards.

Question 3: The shorter wavelength of the blue laser light used in Blu-ray discs is primarily responsible for their significantly faster data transfer rates compared to DVDs.

A. Ano

B. Ne

Explanation: The study materials state that Blu-ray discs use blue laser light which has a shorter wavelength than red laser light, thus increasing the storage capacity when compared to DVDs. While Blu-ray discs do have a much greater data transfer rate than DVDs, the materials do not attribute this directly to the shorter wavelength of the blue laser light, but rather to the increased storage capacity.

Question 4: Which of the following statements accurately compares the characteristics of Blu-ray discs, DVDs, and CDs, according to the provided study materials?

A. Blu-ray discs use red laser light, while CDs and DVDs use blue laser light, allowing Blu-ray to have a shorter wavelength.

B. DVDs have a shorter laser light wavelength (650 nm) compared to CDs (780 nm), contributing to their increased storage capacity.

C. Blu-ray discs have a track pitch of 0.74 μm, which is wider than the 1.60 μm track pitch of a CD, allowing for greater data density.

D. Blu-ray discs offer a much greater data transfer rate than DVDs, being at least four times faster, and have at least five times the storage capacity of an equivalent DVD.

Explanation: Option 0 is incorrect because Blu-ray discs use blue laser light (405 nm), whereas CDs and DVDs use red laser light (780 nm and 650 nm respectively). Option 1 is correct as DVDs use red laser light with a wavelength of 650 nm, which is shorter than the 780 nm used by CDs, contributing to DVDs' higher capacity. Option 2 is incorrect because Blu-ray discs have a track pitch of 0.30 μm, which is narrower than both DVD's 0.74 μm and CD's 1.60 μm, enabling higher data density. Option 3 is correct because the materials state that Blu-ray discs have a much greater data transfer rate than DVDs (at least four times faster) and a storage capacity at least five times that of the equivalent DVD.

Question 5: Pen drives, also known as memory sticks, are solid-state storage devices that connect to a computer through a USB port.

A. Ano

B. Ne

Explanation: The study materials state that 'Pen drives (memory sticks) are small solid-state storage devices that connect to a computer via a USB port.'