Page: 2 – Storage Types

Volatile Storage

• RAM, cache.

• Very fast, but lost on power failure.

• Example: Balance loaded in RAM disappears if system restarts.

Nonvolatile Storage

• Hard disk, SSD, CD/DVD.

• Data survives reboot, but disk can crash.

Stable Storage (ideal concept)

• "Never lost".

• Achieved using:

  • Multiple copies on different disks.

  • Redundant writes.

  • Recovery methods.