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Storage Devices & Capacity Units

Introduction

Storage devices are used to store data, programs, and information for future use. Competitive exams frequently test candidates on types of storage devices and data measurement units such as KB, MB, GB, and TB.

These questions are practical, fact-based, and commonly asked in IBPS, SBI, and SSC exams.

Pattern: Storage Devices & Capacity Units

Pattern

The key idea is to identify storage devices based on technology (magnetic, optical, solid-state) and correctly convert or compare data capacity units like KB, MB, GB, and TB.

Step-by-Step Example

Question

Which of the following correctly represents storage devices arranged in increasing order of data storage capacity?

Options:
A. CD < DVD < Blu-ray Disc
B. Blu-ray Disc < DVD < CD
C. DVD < CD < Blu-ray Disc
D. CD < Blu-ray Disc < DVD

Solution

  1. Step 1: Recall storage capacities

    CD stores less data than DVD, and DVD stores less data than Blu-ray Disc.

  2. Step 2: Arrange in increasing order

    Smallest capacity → CD, then DVD, then Blu-ray Disc.

  3. Final Answer:

    CD < DVD < Blu-ray Disc → Option A

  4. Quick Check:

    CD (~700 MB) < DVD (~4.7 GB) < Blu-ray (~25 GB) ✅

Quick Variations

• Questions may compare HDD and SSD based on speed and durability.

• Sometimes unit conversion (MB to GB, GB to TB) is tested.

• Optical, magnetic, and solid-state devices may be mixed in options.

Trick to Always Use

  • Step 1 → Optical discs capacity order: CD < DVD < Blu-ray
  • Step 2 → Remember unit ladder: KB → MB → GB → TB
  • Step 3 → SSD is faster than HDD but costlier

Summary

Summary

  • Storage devices store data permanently for future use.
  • Common storage devices include HDD, SSD, CD, DVD, and Blu-ray Disc.
  • Data capacity increases from KB to MB to GB to TB.
  • Capacity comparison questions are frequent and scoring.

Example to remember:
CD < DVD < Blu-ray | KB < MB < GB < TB

Practice

(1/5)
1. Which of the following is a solid-state storage device?
easy
A. SSD
B. Hard Disk
C. DVD
D. Blu-ray Disc

Solution

  1. Step 1: Recall storage technologies

    Solid-state storage uses flash memory and has no moving parts.

  2. Step 2: Evaluate options

    SSD uses flash memory, while Hard Disk is magnetic and DVD/Blu-ray are optical.

  3. Final Answer:

    SSD → Option A

  4. Quick Check:

    No moving parts + flash memory → SSD ✅
Hint: Flash memory without moving parts indicates SSD.
Common Mistakes: Confusing hard disk with solid-state storage.
2. Which unit of data storage is immediately larger than a Gigabyte (GB)?
easy
A. Megabyte (MB)
B. Terabyte (TB)
C. Kilobyte (KB)
D. Byte

Solution

  1. Step 1: Recall the unit hierarchy

    Data units increase in the order: KB → MB → GB → TB.

  2. Step 2: Identify the next larger unit

    After Gigabyte (GB), the next larger unit is Terabyte (TB).

  3. Final Answer:

    Terabyte (TB) → Option B

  4. Quick Check:

    GB followed by TB in the unit ladder ✅
Hint: Remember the ladder: KB-MB-GB-TB.
Common Mistakes: Choosing MB because of confusion in unit order.
3. Which of the following storage devices uses magnetic technology?
easy
A. Pen Drive
B. SSD
C. Hard Disk
D. DVD

Solution

  1. Step 1: Identify magnetic storage

    Magnetic storage devices store data using magnetic coating.

  2. Step 2: Check each option

    Hard Disk stores data on magnetic platters.

  3. Final Answer:

    Hard Disk → Option C

  4. Quick Check:

    Magnetic platters → Hard Disk ✅
Hint: Magnetic disks always indicate HDD.
Common Mistakes: Thinking SSD also uses magnetic storage.
4. Which of the following correctly converts 1 Terabyte (TB) into Gigabytes (GB)?
medium
A. 100 GB
B. 512 GB
C. 1000 GB
D. 1024 GB

Solution

  1. Step 1: Recall standard conversion

    In computer memory units, binary conversion is commonly used.

  2. Step 2: Apply conversion rule

    1 TB equals 1024 GB.

  3. Final Answer:

    1024 GB → Option D

  4. Quick Check:

    Each higher unit = 1024 of the lower unit ✅
Hint: Use 1024-based conversion for memory units.
Common Mistakes: Using decimal conversion instead of binary.
5. Which of the following storage devices is MOST suitable for fast data access and durability?
medium
A. SSD
B. CD
C. DVD
D. Magnetic Tape

Solution

  1. Step 1: Identify requirements

    Fast access and durability require modern storage with no moving parts.

  2. Step 2: Compare devices

    SSD offers high speed and durability compared to optical and tape storage.

  3. Final Answer:

    SSD → Option A

  4. Quick Check:

    No moving parts + high speed → SSD ✅
Hint: Fastest and durable storage → SSD.
Common Mistakes: Choosing optical media for speed.

Mock Test

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