Block storage devices, local (connected to one EC2 Host), not network. Provided with specific instance types, included in price anyway even if you don’t use it.
Highest storage performance in AWS. Must be attached at launch – one chance to attach. Can’t attach if instance already lauched. Launch time only.
They lose the storage if they are stopped (Ephemeral) and if Hardware fails. Or move, or change.
ERROR
IF AWS MAKES A MAINTENANCE, INSTANCE IS MOVED TO NEW EC2 HOST, SO YOU LOSE DATA ON INSTANCE STORE, HARDWARE FAILURE WILL DESTROY DATA TOO.
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Suitable for quick changing content like cache, buffer, temp.
Gigabits per second.