TechTayari

C4 · Computers & Networks · Grade 7–9 · ages 12–15

RAM & Storage

Memory and the Disk

Grade 7–9 · Memory & storage basicsCBE strandFree · works offline

▶ Start the interactive lesson

The full lesson adds narration, an interactive mission and a 10-question bank, and the quiz explains any mistakes.

RAM is the backpack

RAM holds what the computer is using right now: the open app, the page you're reading. It is very fast but it empties when you switch off.

Storage is the shelf

Storage (the disk) keeps everything even with the power off: your apps, documents, photos, music. SSDs are fast; older hard disks (HDD) spin a platter and are slower.

SSD vs HDD

An SSD has no moving parts and loads much faster than a spinning hard disk. The fastest type, NVMe, makes programs and files open quickly.

When RAM fills up

If RAM fills, the computer borrows slower space on the disk and everything feels sluggish. Closing unused browser tabs and apps frees the backpack.

How big?

RAM is usually a few GB (e.g. 4, 8, 16). Storage is bigger — often hundreds of GB or 1 TB. More RAM helps with many apps open; more storage holds more files.

Key points

  • RAM holds what the computer is using right now — and empties when off.
  • Storage, the disk, keeps everything even with the power off.
  • An SSD has no moving parts and is much faster than an old hard disk.
  • NVMe SSDs are the fastest and open programs quickly.
  • If RAM fills up, the computer slows down.
  • Close unused tabs and apps to free the backpack.
  • RAM is a few GB; storage is often hundreds of GB or a whole terabyte.

Try it for real: Memory detective

  • In Task Manager > Performance (or a monitor), note total RAM and how much is in use.
  • Open about ten browser tabs and check RAM again. Did it rise?
  • Find whether your disk is an SSD or HDD, and its size.
▶ Start the interactive lesson