Overview

• Multiple independent testers, including an X user and Japanese enthusiast groups, have reproduced SSD failures after installing KB5063878.
• The issue typically appears during sustained transfers of around 50 GB at over 60% controller usage, with drives disappearing from Windows and SMART data becoming unreadable.
• Reports point to Phison-controller SSDs—notably DRAM-less models such as the Corsair Force MP600 and SanDisk Extreme PRO—as disproportionately affected.
• Neither Microsoft nor SSD manufacturers have officially verified the failure pattern, leaving the scope and regional reach of the issue uncertain.
• Experts and outlets recommend suspending prolonged sequential write operations until Microsoft or drive vendors release firmware updates or an OS-level patch.