Which unit of storage represents exactly $2^{40}$ bytes of data? MCQ with Answer and Explanation

Which unit of storage represents exactly $2^{40}$ bytes of data?
A. 1 Megabyte
B. 1 Petabyte
C. 1 Gigabyte
D. 1 Terabyte
Answer: Option D
Solution (By JKSSB Mock Tests)
$2^{10}$ is Kilobyte, $2^{20}$ is Megabyte, $2^{30}$ is Gigabyte, and $2^{40}$ is Terabyte. Thus, $2^{40}$ bytes equals 1 Terabyte (TB).

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Practice More Memory and Storage Devices Questions

Question #1
What is the term used to describe the organization of matching tracks across all physical platter surfaces in a multi-platter hard disk drive?
A. Sector Array
B. Block Group
C. Cylinder
D. Cluster

Correct Answer: Option C


Explanation:
A cylinder consists of the exact same track number intercepted vertically across all available platter surfaces in a hard disk drive assembly.

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Question #2
Which ROM type can be completely erased by exposing its internal semiconductor die to strong ultraviolet (UV) light waves?
A. PROM
B. EPROM
C. Flash ROM
D. EEPROM

Correct Answer: Option B


Explanation:
EPROM (Erasable Programmable Read-Only Memory) chips feature a distinctive transparent quartz window over the die through which ultraviolet light is applied to erase data.

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Question #3
Which component of a hard disk contains the actual data?
A. Read/write head
B. Actuator
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D. Spindle

Correct Answer: Option C


Explanation:
Data is stored on the platters, which are circular disks coated with magnetic material. The read/write head reads and writes data to the platters.

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