Final answer:
A drive known as a quorum disk or witness disk maintains the quorum in a cluster by holding shared configuration data to coordinate operations and prevent data inconsistency.
Step-by-step explanation:
When discussing what drive maintained the quorum in a cluster, we're referring to a mechanism that ensures that there is consistency and coordination among the nodes in a cluster, particularly in the realm of network computing or distributed systems. A quorum is a concept employed to prevent the "split-brain" scenario, where two separate subsets of a cluster might believe they are both active and capable of managing resources, which can lead to data inconsistency. The drive that maintains quorum, commonly referred to as a quorum disk or witness disk, holds the shared configuration data necessary to determine the active membership status and coordinate cluster operations.