Microsoft is seeking further information from customers who reported failure and data corruption issues affecting their solid-state drives (SSDs) and hard disk drives (HDDs) after installing the August 2025 security update.
Microsoft told BleepingComputer on Wednesday that it is aware of reports that installing the KB5063878 security update is causing SSD and HDD data corruption and failure issues.
In a service alert seen by BleepingComputer, the company added that it couldn’t reproduce the issue on up-to-date Windows 11 24H2 systems and is now attempting to collect user reports with additional information from those affected.
“We are actively working with our storage device partners to try to reproduce the issue. At the time of this publication, neither internal testing nor telemetry have identified an increase in disk failure or file corruption,” the company said.
“In addition, Microsoft customer support teams haven’t received reports of customers experiencing this issue. If you are experiencing this issue, please contact Support for Business or use the Feedback Hub to file a report.
The company is also investigating if this issue is Microsoft’s fault and has promised to provide an update when more details are available.
Reportedly impacts multiple SSD and HDD models
This issue was first reported last week by a Japanese PC builder who saw SSDs disappear from the OS during heavy write operations (like writing large files or many files at once) to drives that were over 60% full on devices with the KB5062660 preview update or this month’s Windows 11 24H2 security update installed.
Other users have encountered the same issue on systems with Corsair Force MP600, Maxio SSD, SanDisk Extreme Pro, Kioxia Exceria Plus G4, Kioxia M.2, and various other drives with Phison and InnoGrit controllers.
A spokesperson for NAND controller maker Phison also shared a statement with BleepingComputer on Wednesday, saying that the company is “working with Microsoft to resolve the issue.”
“Phison has recently been made aware of the industry-wide effects of the ‘KB5063878’ and ‘KB5062660’ updates on Windows 11 that potentially impacted several storage devices, including some supported by Phison,” a Phison spokesperson told BleepingComputer.
“We understand the disruption this may have caused and promptly engaged industry stakeholders. [..] At this time, the controllers that may have been affected are under review and we are working with partners.”
Until the issue is addressed, Windows users should avoid writing large files (tens of gigabytes) and extract large compressed files with many items (e.g., 200 files of 200 MB each) in several steps rather than all at once.
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