Which disk drive type contains a magnetic HDD with onboard flash memory serving as a non-volatile cache?

SSHD - Solid State Hybrid Drives

Explanation:

SSHD - Solid State Hybrid Drives -

Hard disk refers to a storage form of device, which uses uses the combination of the fast storage medium like the solid - state drive along with the very higher - capacity hard disk drive.

In the solid state hybrid drives, the combination of the onboard flash memory and the magnetic HDD, which is less expensive than the SSD.

Hence, from the given information of the question,

The correct term is SSHD - Solid State Hybrid Drives.