This is by design and necessary due to slow volsnap copy on write performance on fragmented SSD volumes.' Storage Optimizer will defrag an SSD once a month if volume snapshots are enabled. 'Actually Scott and Vadim are both wrong. Microsoft developers, though, have stated in the past that there is some benefit to defragging a solid-state drive (SSD) that has become heavily fragmented, and due to this will defrag an SSD drive once a month. The general rule has always been that you should avoid defragging solid-state drives (SSDs) to prevent unnecessary wear and tear. Until that fix makes it into release builds, the 'forgetting' of when the drive was last optimized, cascades into other unwanted behavior as described below. We’ve fixed it in this build,' the release notes state. 'Thank you for reporting that the Optimize Drives Control Panel was incorrectly showing that optimization hadn’t run on some devices. In Windows 10 Insider Preview build 19551, Microsoft states that the issue has been fixed. Not remembering when drives were optimized
