Storage devices and media
Compare magnetic, optical and solid-state storage by capacity, access, portability, durability, cost and purpose.
Exam scope and assessment notes
Cambridge IGCSE Information and Communication Technology 0983, for exams in 2026, 2027 and 2028. Examples, datasets and practice are original StudyForA material; they are not Cambridge questions, source files, mark schemes or grades. Practical lessons teach transferable operations, but learners must perform them in locally available office and web-authoring software and inspect their own files. This site does not reproduce a Cambridge practical examination or award an official grade. The separate 2029 syllabus is not mapped here. Cambridge states that IGCSE 0983 has the same subject content as IGCSE 0417, with 9–1 grading. This StudyForA pathway maps the 2026–2028 syllabus only. This 9–1 graded qualification is available only in a limited number of administrative zones. Confirm that your centre can enter you for this code and exam series with Cambridge International. Cambridge has published a separate syllabus for 2029. StudyForA has not reconciled that version yet; this page supports exams in 2026, 2027 and 2028 only.
Before you begin
- No previous ICT course is assumed. Read each scenario carefully and justify a tool or method by connecting it to the task, user and constraints.
Work on paper. Try each question before revealing help, and explain why your method works.
Quick readiness check
Which medium is designed for sequential access and can be suitable for a rarely accessed archive?
What you will learn
- Describe magnetic, optical and solid-state devices and media, including hard drives, tape, CD/DVD/Blu-ray, SSDs, flash drives and memory cards.
- Compare backing-storage technologies for a stated use and distinguish them from RAM and ROM.
Technology changes the trade-off
Magnetic hard drives store data on magnetised surfaces; tape is sequential and can suit large archives. Optical discs use laser-readable tracks and can be distributed physically. Solid-state drives and flash media use electronic cells, have no moving parts and can offer fast access, but their cost, capacity and write-life depend on the device.
Choose backing storage for purpose
A storage device is the hardware; the medium is where data is held. An SSD is a device containing solid-state storage; a removable memory card is a medium used by a compatible device. RAM is fast working memory, not a substitute for backing storage because it is volatile. Consider compatibility, backup, access speed, portability, physical risk and transmission needs.
Sources for this lesson
Pause and explain
A photographer moves large files between a camera and a laptop. What should guide the storage choice?
Worked example
A school must keep daily attendance records for quick access and archive annual copies for several years. Recommend a storage approach.
Show the worked solution
- Current records need fast access and regular backup.
- Long-term archives may be accessed rarely and should be stored separately from the working copy.
- Choose compatible media and check restoration, security and retention requirements.
Answer Keep working records on a reliable solid-state or network-backed system for quick access, with controlled access and a second backup. Store annual archive copies on appropriate separate media or managed storage, and test that archived files can be restored; no single device protects against every failure.
Try a topic test
Choose Easy, Normal or Difficult. Save your answers and open worked review after finishing.
Test this topic →From guided practice to a new situation
Write your answer and reasoning first. Use a hint only if you are stuck. The model solution is for self-checking; your written work is not automatically marked.
Classify a fixed hard disk, magnetic tape, Blu-ray disc, SSD, memory card and RAM by technology and purpose.
Give me a hint
Separate volatile internal memory from persistent magnetic, optical or solid-state storage.
Compare my reasoning
- A hard disk and tape are magnetic; Blu-ray is optical.
- An SSD and memory card are solid-state backing storage.
- RAM is volatile internal memory.
Fixed hard disk and magnetic tape: magnetic backing storage. Blu-ray: optical media. SSD and memory card: solid-state backing storage. RAM: volatile internal memory used while programs run.
Look for these in your work
- Classifies all six items
- Separates RAM from backing storage
A small museum needs to keep a backup of rarely viewed video interviews and restore an individual file quickly if requested. What should it consider?
Give me a hint
Balance storage cost against retrieval time, capacity, independent copies and restoration.
Compare my reasoning
- Estimate total archive size and how often a file is retrieved.
- Compare tape, optical and solid-state or managed storage for capacity and access.
- Keep a separate copy and test restoration rather than trusting a device label.
Tape can be cost-effective for a large archive but retrieving one item is sequential; disk or managed storage can provide faster individual access. The museum should compare cost, capacity and compatibility, keep an independent second copy and test recovery. The best choice depends on access frequency and retention needs.
Look for these in your work
- Uses the actual access pattern
- Includes backup and restoration testing
Explain why an optical disc might be useful for distributing a read-only resource yet unsuitable as the only copy of a frequently edited project.
Give me a hint
Compare distribution, rewriting, physical wear and backup needs.
Compare my reasoning
- A disc can be physically distributed without a network connection.
- Repeated updates and writes may be inconvenient or impossible depending on the disc.
- Frequent editing calls for an appropriate working copy and versioned backup.
A read-only disc can provide a portable distribution copy that recipients can use without internet access. It is inconvenient for frequent edits and some discs cannot be rewritten. Keep a current working file and a separate, tested backup; use the disc only for a stable release copy.
Look for these in your work
- Identifies a suitable use
- Explains why it is poor as the only live copy
Common mistakes
- Calling a storage medium the same thing as the device
- Assuming any one technology is always fastest or safest
- Failing to test whether a backup can be restored
What can you explain now?
Why is a removable SSD not a replacement for RAM?
Compare with the explanation
It is backing storage and does not act as the computer's volatile working memory.
The CPU needs fast internal working memory for currently used instructions and data; backing storage retains files when power is removed.
After trying it yourself, choose your next review. This is your self-assessment.
Your review choice appears on Today. Sign in to sync it across devices.
Make it stick
Compare one magnetic, one optical and one solid-state storage option, including one strength and limitation for each.
If you needed the solution, close it and solve the problem again from a blank page. A correct answer is stronger when you can explain the reason for each step.