Answer:
Nonvolatile because the data is not lost once the computer is turned off
Step-by-step explanation:
For long term storage purpose it is essential to use the Nonvolatile device because Data stored in it is not lost once the system is turned off. while Volatile devices tend to loss data stored in them once the system is turned off.
Volatile devices are better used when high speed data access is required while nonvolatile devices are used for longer -term data storage purposes examples of nonvolatile devices includes: hard disks, re-writable optical disks. and a common example of volatile device is RAM.