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While chasing a different issue I noticed that my Windows Event logs had repeated errors from the Defrag service stating "The storage optimizer couldn't complete defragmentation on DrivePool (D:) because: Incorrect function. (0x80070001)". Digging further, I found that the Optimize Drives feature had included the pool's drive letter in the list of drives to optimize. It has also listed the underlying drives in the pool, but that should be OK To remove the drive pool from optimization, open Disk Optimizer, in Scheduled optimization, Change Settings, then Choose drives, and then un-select the pool drive. See https://imgur.com/PB2WPH0