Microsoft has stated that it found no evidence connecting the August 2025 Windows 11 security update (KB5063878) to recent reports of solid-state drive (SSD) and hard disk drive (HDD) failures.
The company first acknowledged the complaints last week, after some users reported drive corruption and crashes following the installation of the Windows 11 24H2 update. Microsoft launched an internal review and began gathering technical details from affected users.
“After thorough investigation, Microsoft has found no connection between the August 2025 Windows security update and the types of hard drive failures reported on social media,” the company said in a service alert update. “We will continue to monitor feedback after every release and investigate any future reports.”
Microsoft added that it worked with major storage hardware partners to test the issue, but neither its own telemetry nor industry testing showed an increase in drive failures linked to the update.
Reports from users in Japan spark concerns
The first wave of complaints surfaced in Japan, where some users reported SSD issues during heavy write operations — such as moving or copying very large files — on drives that were more than 60% full. Reports pointed to issues affecting several models, including Corsair Force MP600, SanDisk Extreme Pro, Kioxia Exceria Plus G4, and drives using InnoGrit and Phison controllers.
Some users said their drives recovered after a system restart, while others reported that their hardware remained inaccessible even after rebooting.
Industry partners investigating
Storage controller manufacturer Phison confirmed that it is actively working with Microsoft to assess the problem.
“We understand the disruption this may have caused and promptly engaged industry stakeholders,” a Phison spokesperson said. “At this time, the controllers that may have been affected are under review, and we are working with partners.”
While Microsoft has not confirmed a link between the update and the failures, users are being cautious. Until the cause is fully identified, those running Windows 11 with drives more than 60% full are advised to avoid heavy write operations, such as transferring very large files or handling large batches of data.
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