Overview

• Phison acknowledged industry reports that Windows 11 updates KB5063878 and KB5062660 may affect some storage devices and said its controllers are under review with partner advisories to follow.
• Users and independent tests describe drives vanishing from Windows, unreadable SMART data, and likely file corruption during sustained transfers of roughly 50GB when controller utilization is high.
• Community lists and anecdotes highlight several affected models, often using Phison controllers such as the PS5012-E12, while other SSDs tested appear unaffected, indicating a model‑specific pattern.
• Microsoft previously fixed a separate installation error tied to WSUS (0x80240069) and has not verified that the security update causes SSD or HDD failures.
• Reports remain limited and are largely concentrated among users in Japan, and experts recommend backing up data, avoiding large sequential writes, pausing updates if not yet installed, and submitting incident details to vendors or Microsoft.