Final answer:
The disk drive type with a magnetic HDD and onboard flash memory as a cache is the Solid-State Hybrid Drive (SSHD).
Step-by-step explanation:
The disk drive type that contains a magnetic HDD with onboard flash memory serving as a non-volatile cache is known as a Solid-State Hybrid Drive or SSHD. This type of drive integrates the features of an SSD (solid-state drive) with the larger storage capacity of a traditional HDD (hard disk drive). SSHDs use flash memory as a cache for frequently accessed data, which improves overall system performance compared to a standard HDD. This type of disk drive offers faster performance than a traditional HDD, but costs less than an SSD.