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Volatile Storage (VS) devices lose data when power is interrupted or turned off. By contrast, non-volatile devices are able to keep data regardless of the status of the power source.

Common types of volatile storage include:

• Static Random Access Memory (SRAM)
• Dynamic Random Access Memory (DRAM)

Manufacturers may add battery power to a volatile memory device to enable it to persistently store data or controller code.

Source: https://searchstorage.techtarget.com/definition/nonvolatile-storage