Overview

• Independent tests by X user @Necoru_cat and tech outlets tie KB5063878 to SSDs disappearing from Windows after roughly 50 GB of sequential writes
• Affected drives reportedly show unreadable SMART data, inaccessible partitions and controller lockups that often require a restart to restore functionality
• A preliminary list from NichePCGamer points to Phison-controller SSDs—including the Corsair Force MP600 and PS5012-E12 models—among those most frequently mentioned
• Neither Microsoft nor SSD manufacturers have publicly confirmed the failures, and analysts suspect a storage driver or kernel-level regression triggered by the update
• Users are advised to limit extended sequential writes on suspect drives and maintain current backups while investigations and official verifications proceed