---
title: "Data archiving vs data storage"
subject: "Instrumentation II"
chapter: 5
key: "semester_5/instrumentation_ii:archiving-vs-storage"
source: https://www.bctengineer.com/q/semester_5/instrumentation_ii/archiving-vs-storage
site: BCT Engineering
---

# Data archiving vs data storage

Instrumentation II · Chapter 5: Data Acquisition And Transmission

- Asked in: 2072 Chaitra, 1 marks; 2075 Asoj, 1 marks (asked 2 times)
- Answer checked by Claude Sonnet 5.5 on 2026-10-14
- Page: https://www.bctengineer.com/q/semester_5/instrumentation_ii/archiving-vs-storage
- Whole chapter: https://www.bctengineer.com/md/semester_5/instrumentation_ii/chapter-5

## Question

Compare and contrast the terms data archiving and data storage.

## Short answer

Data storage holds active, frequently accessed data on fast media like SSDs for daily use. Data archiving preserves rarely accessed, fixed data on low-cost media like tape for long-term retention and compliance.

## Answer

| Point | Data storage | Data archiving |
|---|---|---|
| Purpose | Keep current, active data available for daily use and processing | Keep old, rarely used data for the long term (history, legal, backup) |
| Access | Fast and frequent (online) | Slow and rare (offline or nearline) |
| Data | Working data that changes | Fixed data, usually not modified |
| Media | Hard disk, SSD, RAM, flash | Tape, optical disc, cold cloud storage |
| Cost per GB | Higher | Lower |
| Retention | Short to medium term | Many years, with compliance rules |
| Management | Backed up often | Indexed, compressed, protected against ageing |
| Example | Logger memory, database | Sensor logs from previous years kept on tape |

Storage is for operation; archiving is for preservation.

## Check yourself

The answer's key points as multiple-choice questions, with the correct option and why.

1. What is the main purpose of data archiving compared with data storage?
   A. Fast daily access to working data
   B. Storing data in RAM only
   C. Increasing the cost per GB
   D. Long-term preservation of old, rarely used data
   Answer: D. Storage is for operation, archiving is for preservation. (Key point: Purpose)

2. Which pairing is correct?
   A. Archiving: slow, rare access on tape or optical discs; storage: fast access on disk or SSD
   B. Archiving: fast access on SSD; storage: tape
   C. Both use tape only
   D. Archiving: frequent changes; storage: fixed data
   Answer: A. Archived data is fixed and kept offline or nearline on cheap media. (Key point: Access and media)

3. How does cost per GB compare?
   A. Archiving is higher, storage is lower
   B. Archiving is lower, storage is higher
   C. They are always equal
   D. Archiving has no cost
   Answer: B. Cheaper media are used for archives, while storage uses fast, costlier media. (Key point: Cost per GB)

## Related in Instrumentation II

- [Compare software models; propose a fourth model](https://www.bctengineer.com/question.md?key=semester_5%2Finstrumentation_ii%3Asw-models-compare-fourth) — Instrumentation II, chapter 9
- [Digital transmission system; analog vs digital](https://www.bctengineer.com/question.md?key=semester_5%2Finstrumentation_ii%3Aanalog-digital-transmission-compare) — Instrumentation II, chapter 5
- [Data logging system for optical, satellite, Bluetooth](https://www.bctengineer.com/question.md?key=semester_5%2Finstrumentation_ii%3Adata-logging-three-schemes) — Instrumentation II, chapter 5
- [USB interface chips: device vs host](https://www.bctengineer.com/question.md?key=semester_5%2Finstrumentation_ii%3Ausb-interface-chips) — Instrumentation II, chapter 3
- [USB enumeration; device vs host interface chips](https://www.bctengineer.com/question.md?key=semester_5%2Finstrumentation_ii%3Ausb-enumeration) — Instrumentation II, chapter 3
- [Case study: existing vs proposed system](https://www.bctengineer.com/question.md?key=semester_5%2Finstrumentation_ii%3Acs-2074asoj) — Instrumentation II, chapter 10

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