Final answer:
Cached disk blocks are prioritized by algorithms such as Least Recently Used (LRU), Most Frequently Used (MFU), and First-In-First-Out (FIFO) to optimize disk performance by keeping relevant data readily available.
Step-by-step explanation:
Cached disk blocks are prioritized based on a variety of algorithms that determine their usage and how often they are accessed. Common strategies include Least Recently Used (LRU), where the blocks not used for the longest period of time are replaced first, or Most Frequently Used (MFU), which prioritizes blocks based on how often they are accessed. Another common method is the First-In-First-Out (FIFO) algorithm, where the oldest blocks in the cache are replaced regardless of their usage frequency. These strategies aim to optimize disk performance by ensuring that the most relevant data is readily available in the cache while minimizing the need to access data from the slower disk.