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How does an SSD work?

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Quick answer

An SSD (solid-state drive) works by storing data as electric charge trapped in billions of tiny flash-memory cells, with no moving parts. A controller chip decides where to write and read, making SSDs far faster and more durable than spinning hard drives.

Step by step

  1. Data is held in NAND flash cells that trap electrons to represent 1s and 0s.
  2. The charge stays put even with the power off, so storage is non-volatile.
  3. A controller spreads writes evenly ('wear leveling') so cells don't wear out early.
  4. With no moving parts, access is near-instant and far more shock-resistant than a hard drive.
  5. Cells wear out after many write cycles, but modern drives last many years in normal use.

People also ask

Why is an SSD faster than a hard drive?
It has no spinning platter or moving head to wait on — data is reached electronically almost instantly, so it's many times faster.
Do SSDs wear out?
Each flash cell tolerates a limited number of writes, but wear-leveling and large capacities mean typical drives outlast most users' needs.
Does an SSD lose data when unplugged?
In normal use it retains data for years without power; only after very long unpowered storage can the charge slowly leak.
How does an SSD work?
It stores data as electrical charges in flash memory chips, with no moving parts, for fast access.
Why are SSDs faster than hard drives?
They have no spinning disks or moving heads, so they can access any data almost instantly.