Applications of Storage
Choosing the Right Storage
The best storage type depends on the specific requirements of the scenario. Key factors to weigh:
| Factor | Questions to Ask |
|---|---|
| Capacity | How much data needs to be stored? |
| Speed | How quickly does the data need to be accessed? |
| Portability | Does the storage need to move between locations? |
| Durability | Will the device be dropped, shaken or exposed to harsh conditions? |
| Cost | What is the budget? Is cost-per-GB important? |
| Reliability | How critical is it that data is not lost? |
Common Scenarios
Desktop PC
- Recommended: Magnetic HDD (or HDD + SSD combination)
- Why: A desktop is stationary, so durability of moving parts is less critical. HDDs offer very high capacity at low cost-per-GB, ideal for storing large volumes of data.
- Common config: Small SSD for the OS (fast boot) + large HDD for data storage.
Portable Device (Camera, Music Player)
- Recommended: Solid-State (SSD or flash)
- Why: Portable devices are dropped and shaken. SSDs have no moving parts and can survive physical shock that would destroy an HDD.
Large Company Backup
- Recommended: Magnetic tape
- Why: Tape has very high capacity and is extremely cheap per GB. Speed doesn’t matter for archival backups that are rarely accessed.
Distributing Software / Media
- Traditionally: Optical disc (DVD/Blu-ray)
- Now: Cloud storage / digital download
- Cloud advantage: Instant access, no physical media required
- Cloud disadvantage: Requires a reliable internet connection; creates dependency on a third-party service; raises data privacy concerns
Laptop (Dual Storage)
- SSD for the operating system, fast boot and load times
- Traditional HDD for mass data storage, large, cheap capacity
Cloud Storage Considerations
Cloud Dependency
Centralised cloud services (Google Drive, OneDrive, etc.) create a dependency on a single corporation. Outages, policy changes or account suspension can cut off access. , Privacy: Data is held by a third party , Internet required: No connection = no access , Alternative: Self-hosted or decentralised cloud for data sovereignty
Exam Questions
Q: Why is a magnetic disk better for a desktop PC and an SSD for a portable camera?
A magnetic disk offers cheap, high-capacity storage suitable for a stationary desktop. An SSD provides the durability needed for a portable camera as it has no moving parts that could be damaged by movement.
Q: Why is magnetic tape better than optical media for large company backups?
Magnetic tape has a very high capacity suitable for large backups, whereas optical media’s low capacity makes it impractical for this purpose.
Q: What is a key advantage and disadvantage of distributing software via the cloud?
Advantage: instant access without physical media. Disadvantage: requires a reliable internet connection and creates dependency on a third-party service.
Exam Tip
In “suggest a suitable storage device” questions, always justify your choice by referring to at least two relevant characteristics (e.g., speed + durability, or capacity + cost).