Microsoft Confirms Samsung Galaxy Connect App Caused Windows 11 C: Drive Access Bug

Microsoft has addressed a serious issue that caused some Windows 11 users to lose access to the system’s C: drive, preventing applications from launching and disrupting normal system operations.

Early reports suggested that the problem primarily affected Samsung devices, particularly Galaxy Book4 laptops and certain Samsung desktop models running Windows 11 versions 24H2 and 25H2.

Issue traced to Samsung Galaxy Connect app

Following an investigation, Microsoft and Samsung determined that the issue was not caused directly by Windows updates. Instead, it was linked to the Samsung Galaxy Connect application.

According to Microsoft, the app triggered a configuration problem that blocked access to the system drive. When the error occurred, users could see a message stating that the C:\ drive was not accessible due to “Access denied.”

This type of failure could severely impact the system, preventing users from opening files, launching installed applications, or performing administrative tasks.

To prevent additional systems from being affected, the Galaxy Connect app was temporarily removed from the Microsoft Store.

Samsung has since republished a stable earlier version of the application designed to avoid triggering the problem.

Affected Samsung models

Microsoft confirmed that several Samsung devices were affected by the issue, including the following models:

• NP750XGJ
• NP750XGL
• NP754XGJ
• NP754XFG
• NP754XGK
• DM500SGA
• DM500TDA
• DM500TGA
• DM501SGA

The issue was reported mostly on systems running Windows 11 versions 24H2 and 25H2.

Possible cause tied to system permissions

Some community members also attempted to analyze the root cause of the problem. A Reddit user suggested that the issue might be related to a broken discretionary access control list (DACL) implementation in Windows images shipped on certain Samsung systems.

If that explanation proves accurate, it would support Microsoft’s statement that the problem originated from Samsung software and system configuration rather than a flaw in the Windows update itself.

Microsoft says it continues working with Samsung to better understand the issue and prevent similar problems in the future. The company has not yet provided additional technical details about the bug.

The situation comes shortly after the February Patch Tuesday update, which has already been associated with several user-reported issues, including installation failures and system crashes.

Separately, Microsoft is also investigating synchronization problems affecting the classic Outlook desktop client.

Via Neowin