A hard drive is non-volatile storage, since it retains all of the data written to it even when it is no longer supplied with power. In general, a computer's internal operating memory is volatile, while its data storage is non-volatile.
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non-volatile memory
Volatile memory is stored temporary, and when power is off, the data stored on it is lost. Ie, RAM (Random access memory) is Volatile, which is why it takes your computer time to turn on. Non-volatile memory stores data permanently and data is not lost when the device is shut down.
The phrase "USB drive" could refer to:
an external hard disk,
a flash-based thumb drive
a USB Floppy Drive
or a CD/DVD drive.
However, all of these types of storage devices are non-volatile memory.
HDD (Hard Disk Drive) is Non Volatile storage device (permanent). It is also considered as Secondary storage device. Secondary storage devices are always non volatile.
Primary storage devices like Ram are volatile (temporary).