Overview

• Microsoft said a service alert review found no link between update KB5063878 and the drive failures reported by users.
• The company reported no post‑update rise in failures or file corruption in telemetry and is collecting detailed cases from affected users.
• Controller maker Phison said more than 4,500 hours of testing did not reproduce the problem and it continues to monitor with partners.
• User accounts describe drives vanishing during sustained large writes, often on volumes over about 60% full, sometimes showing RAW partitions and risking data loss even if the drive returns after a restart.
• Interim advice includes backing up data, avoiding tens‑of‑gigabytes writes on fuller drives, and using heatsinks or thermal pads until the cause is identified.