SS 1 First Term

Lesson objectives

By the end of the week, learners should be able to:

1. Distinguish memory from storage and give one example each.
2. Explain why RAM is volatile and ROM is non-volatile.
3. Convert between bytes, kilobytes, megabytes, gigabytes and terabytes using 1024.
4. Classify storage devices as magnetic, optical or solid state.
5. Compare storage media on capacity, speed, portability and cost.

Key vocabulary

• Memory: working space holding programs and data currently in use.
• Storage: long-term holding of files when the power is off.
• Volatile: loses contents when power is removed.
• Non-volatile: keeps contents without power.
• Byte: eight bits, the basic storage unit.
• Magnetic storage: stores data magnetically, such as a hard drive.
• Optical storage: read by a laser, such as a CD or DVD.
• Solid-state storage: flash memory with no moving parts.
• Capacity: the amount of data a device holds.
• Speed: how quickly data can be accessed.

Common misconceptions

• "Memory and storage are the same." RAM is temporary; storage keeps files when powered off.
• "Deleting a file removes it permanently." Deletion usually moves the file to the Recycle Bin first.
• "Cloud storage means the file is not on any device." Cloud storage needs a connection to reach files.

Teacher activities

1. Starter: ask where a phone photograph goes when the phone is switched off.
2. Draw the memory-versus-storage distinction and place RAM, ROM and storage correctly.
3. Build the unit ladder bit, byte, KB, MB, GB, TB and work two conversions.
4. Pass around a hard disk, a CD, a flash drive and a memory card.
5. Compare capacities by converting and asking how many CDs equal one DVD.
6. Close with the safe-use rules and the backup question.

Student activities

1. Answer the starter in one sentence.
2. Copy the memory and storage diagram and add two examples each.
3. Complete five unit conversions showing the working.
4. Identify each device passed round and write its storage type.
5. Solve two capacity conversion problems with the method shown.
6. Write three flash-drive safety rules and one sentence on backups.

Practical / learning evidence

A conversion worksheet with at least five worked conversions, a three-row storage-type table and the two worked capacity problems. Hand in all three for marking.

Resources and preparation

A hard disk drive, a CD or DVD, a flash drive and a memory card. Calculators for conversion work. Printed conversion worksheets. Offline route: physical media and worksheets. Warn learners not to insert unknown flash drives into laboratory machines.

Assessment for learning

Mark the working, not just the final answer, since a wrong answer from wrong work will fail later questions. Check that RAM sits under memory and not storage. Ask two learners to explain their capacity method aloud before collection.

Inclusion and homework

Provide a printed conversion ladder as a reference and reduce the worksheet to three items where time is short. Extend confident learners with a comparison of SSD and HDD for speed. Homework: find the storage capacity of any phone, memory card or computer you can access in gigabytes.