The Windows 11 update (KB5063878) released on August 12 has caused significant issues, particularly with solid-state drives (SSDs) failing after large data writes. Initially, installation errors were reported mainly among enterprise users, but concerns have since spread to home users as well. An emergency update was issued to address the problems. Users have experienced SSDs becoming non-functional during substantial file transfers, with reports of drives disappearing from the operating system and SMART data becoming unreadable. Experts suggest the failures may be linked to a storage driver or kernel-level regression in the update that mishandles long sequential writes, potentially causing controller lock-ups. Users are advised to avoid long sequential write operations, especially on affected drives.