Bug Report - Samsung Galaxy Connect App Corrupts NTFS Permissions on C: Drive | Windows 11 | Samsung Galaxy Book4 NP750XGJ

Question

To,

Microsoft Support / Windows Feedback Team

Subject: Bug Report - Samsung Galaxy Connect App Corrupts NTFS Permissions on C Drive

Dear Microsoft Support Team,

I am submitting this formal bug report regarding a critical Windows 11 issue on my Samsung Galaxy Book4 laptop that has left my device completely non-functional.

DEVICE AND SYSTEM DETAILS

Device: Samsung Galaxy Book4

Model: NP750XGJ-KG3IN

Serial No: 0SYS9ZAX901311

Processor: Intel Core i7 13th Gen (1355U)

RAM / Storage: 16 GB / 512 GB SSD

OS: Windows 11 Home

Related Updates: KB5079473 (and subsequent March 2025 updates)

ISSUE DESCRIPTION

After installing Windows Updates (including KB5079473), my C drive became completely inaccessible with the error: C is not accessible - Access is denied.

I understand Microsoft has confirmed this is caused by a bug in the Samsung Galaxy Connect app, which corrupted the NTFS ACL (Access Control List) permissions on the C drive. My model (NP750XGJ) is among the officially confirmed affected devices.

However, I want to report the following critical gap: although the Samsung Galaxy Connect app is identified as the trigger, the Windows Update installation sequence appears to have activated or exposed this bug. On the day of the update, the system was working normally before the update and became inaccessible immediately after reboot following the update installation.

RECOVERY ATTEMPTS (ALL FAILED)

1. Windows System Restore - Failed
2. Reset This PC (Keep My Files) - Failed
3. Reset This PC (Remove Everything) - Failed
4. Samsung Recovery Boot options - All Failed
5. Windows Startup Repair - Failed
6. Standard Windows Troubleshooting Tools - Failed

REQUEST TO MICROSOFT

1. Please provide an official step-by-step recovery guide for affected users whose all built-in recovery options have failed
2. Consider issuing a cumulative update or recovery tool that can repair NTFS ACL permissions on the C drive from the Windows Recovery Environment (WinRE)
3. Consider implementing a compatibility block or safeguard hold to prevent future Samsung Galaxy Connect app updates from corrupting NTFS permissions
4. Acknowledge affected users with guidance on whether data recovery is possible before a clean reinstall

This issue has caused complete loss of access to my work data and has affected my professional responsibilities. I request Microsoft to treat this as a high-priority bug and provide an accessible, user-friendly fix.

Thank you for your attention.

Yours sincerely,

Rajesh Kondamudi

Madhira, Khammam District, Telangana - 507203, India

Device Serial No: 0SYS9ZAX901311

Answer 1

COMMUNITY GUIDE — Samsung Galaxy Book4: C Drive Access Denied — How to Diagnose and Fix the Samsung Galaxy Connect App NTFS Bug

Document Date: March 24, 2026 | Based on real resolved case

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1. OVERVIEW

This guide documents a real-world case where a Samsung Galaxy Book4 laptop running Windows 11 became completely unable to access the C drive after a Windows Update installation.

Error shown: "C:\ is not accessible — Access is denied."

This guide covers the root cause, all recovery methods attempted, the official fix, and preventive steps. It is intended to help other users facing the same issue.

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2. AFFECTED DEVICES

Microsoft officially confirmed this issue. The following Samsung Galaxy Book models are affected:

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

• OS: Windows 11 Home (all versions)
• Related Windows Updates: KB5079473 and subsequent March 2025/2026 updates
• Samsung app involved: Samsung Galaxy Connect / Samsung Continuity Service

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3. ROOT CAUSE — OFFICIALLY CONFIRMED

A bug in the Samsung Galaxy Connect app (a Samsung pre-installed application) corrupted the NTFS ACL (Access Control List) permissions on the C drive. The Windows Update installation sequence activated or exposed this bug. This is NOT a hardware failure.

Key facts:

• The system worked normally BEFORE the Windows Update
• The C drive became inaccessible IMMEDIATELY AFTER rebooting post-update
• Microsoft pulled the faulty Galaxy Connect app from the Microsoft Store
• Samsung republished a stable older version of the app
• Microsoft Reference: KB5084914
• No automatic patch was released — manual fix is required

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4. RECOVERY ATTEMPTS & RESULTS

All standard recovery methods were tried and ALL FAILED before the official fix was found:

• Windows System Restore — FAILED
• Reset This PC (Keep My Files) — FAILED
• Reset This PC (Remove Everything) — FAILED
• Samsung Recovery Boot Options — FAILED
• Windows Startup Repair — FAILED
• Standard Windows Troubleshooting — FAILED
• Samsung Official Fix (email support) — SUCCESS

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5. HOW TO FIX — OFFICIAL SAMSUNG/MICROSOFT SOLUTION

Samsung Customer Support provided two options. Option 2 (batch file) is easier and recommended.

OPTION 1 — Manual NTFS Permission Fix

Prerequisite: You must be able to log into Windows with an Administrator account.

Step 1 — Change C Drive Owner:

1. Open File Explorer
2. Right-click Local Disk (C:) > Properties
3. Go to Security tab > click Advanced
4. Next to Owner, click Change
5. Type "Everyone" > click OK
6. Confirm owner changed to Everyone > click OK

Step 2 — Add Temporary Full Control Permission:

7. Right-click C drive > Properties > Security tab
8. Click Edit > click Add
9. Type "Everyone" > click OK
10. Check "Full Control" under Allow for Everyone
11. Click OK > click Yes if Windows Security prompts
12. If "Error Applying Security" appears, click Continue

Step 3 — Verify Access:

13. Open File Explorer
14. Click on Local Disk (C:)
15. Confirm C drive is now accessible

OPTION 2 — Samsung Official One-Click Batch File (Recommended — Easier)

This is Samsung's official automated fix. It runs the same permission reset automatically.

16. Download the fix file: http://orcaservice.samsungmobile.com/filedownloader.aspx?filename=ORCA-12237P01.zip
17. Extract the ZIP file
18. Right-click FixCIssue.bat > select "Run as Administrator"
19. Wait for the message: "Successfully processed 1 files"
20. Press Enter when the "Pause" message appears
21. Restart the laptop
22. Verify C drive is accessible

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6. CRITICAL SECURITY STEP — REVERT PERMISSIONS AFTER FIX

WARNING: The fix grants "Everyone = Full Control" on the C drive. This is a TEMPORARY measure and is a security risk. You MUST revert to proper permissions immediately after the fix.

23. Right-click C: > Properties > Security > Advanced
24. Change Owner back to SYSTEM or your username
25. Remove "Everyone" from the Security tab
26. Ensure the following correct permissions are set:
    • SYSTEM: Full Control
    • Administrators: Full Control
    • Your User Account: Full Control
    • Users: Read & Execute only
27. Click OK > Apply > Restart the laptop

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7. HOW TO REPORT THE ISSUE

Report to Samsung India:

• Toll-Free: 1800-5-726786 (Mon-Sun, 8AM-10PM IST)
• Email: ******@samsung.com
• Service Head: ******@samsung.com
• Portal: samsung.com/in/support/contact

Report to Microsoft:

• Feedback Hub: aka.ms/feedbackhub
• Community Forum: answers.microsoft.com
• Reference KB article: KB5084914

Key points to mention:

• Reference Microsoft KB5084914 — known confirmed bug
• Model number and serial number of your device
• State clearly this is a Samsung software defect, not hardware failure
• Request no-cost repair even if warranty has expired

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8. PREVENTIVE MEASURES
9. Uninstall or disable Samsung Galaxy Connect / Samsung Continuity Service app
10. Revert C drive permissions to SYSTEM/Admin settings (see Section 6)
11. Back up important data to D drive or external storage regularly
12. Keep Windows 11 and Samsung drivers updated for future patches
13. If the issue recurs, escalate directly to Samsung Service Centre

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9. TIMELINE SUMMARY

• March 2026: Windows Update installed — C drive became inaccessible after reboot
• March 17, 2026: Complaints submitted to Samsung (email, WhatsApp, Service Head) and Microsoft Q&A forum
• March 17, 2026: Samsung Shop Support acknowledged — escalated to Service Team
• March 18, 2026: Microsoft published official workaround KB5084914
• March 24, 2026: Follow-up complaints sent to Samsung India and Microsoft Grievance Officer
• March 24, 2026: Samsung India support agent replied with official fix steps + batch file link
• March 24, 2026: Fix applied — C drive fully restored — No data loss — CASE CLOSED

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This guide is based on a real resolved case. Microsoft KB Reference: KB5084914. Document Date: March 24, 2026.

Share freely to help other Samsung Galaxy Book users facing this issue.

Answer 2

UPDATE - ISSUE RESOLVED (March 24, 2026)

Hello everyone,

I am the original poster of this bug report. I am happy to share that my issue has been RESOLVED. I am posting the full solution here so that other Samsung Galaxy Book4 users facing the same "C: Drive Access Denied" issue can benefit from it.

ROOT CAUSE (Confirmed)

The Samsung Galaxy Connect / Continuity service (pre-installed OEM software on Samsung Galaxy Book series) corrupted the NTFS permissions on the C: drive after a Windows 11 Update. This caused the drive owner and permission entries to be reset, blocking all user-level access.

SOLUTION - OPTION 1: Manual NTFS Permission Fix

This is what resolved my issue:

1. Right-click C: drive > Properties > Security > Advanced
2. Click "Change" next to Owner > Type "Everyone" > Click OK
3. Tick the checkbox: "Replace all child object permission entries"
4. Click Apply > Yes/Continue on all prompts
5. Go back to Security tab > Click Edit > Add > Type "Everyone" > OK
6. Select "Everyone" and tick "Full Control" under Allow
7. Click OK > Apply > Restart the laptop

Result: C: drive became fully accessible immediately after restart.

SOLUTION - OPTION 2: Samsung Official Batch Fix

Samsung Support also provided an official fix:

1. Download ORCA-12237P01.zip from Samsung service portal
2. Extract the ZIP file
3. Right-click FixCIssue.bat > Run as Administrator
4. Wait for the message: "Successfully processed 1 files"
5. Press Enter to close > Restart laptop

IMPORTANT SECURITY NOTE

After applying Option 1, the "Everyone = Full Control" permission on C: is a security risk. Once your drive is accessible, please revert to proper permissions:

1. Right-click C: > Properties > Security > Advanced
2. Change Owner back to SYSTEM or your username
3. Remove "Everyone" from the Security tab
4. Ensure these accounts have correct permissions:
   • SYSTEM: Full Control
   • Administrators: Full Control
   • Your Username: Full Control
   • Users: Read & Execute
5. Click OK > Apply > Restart

PREVENTIVE MEASURES

• Remove or disable Samsung Galaxy Connect / Continuity service to prevent recurrence
• Keep Windows 11 and Samsung drivers updated
• Back up data regularly to an external drive or D: drive

I hope this helps other users facing the same issue. If both options fail, please escalate to Samsung Service Center directly.

Device: Samsung Galaxy Book4 (NP750XGJ-KG3IN) | Windows 11 Home | Intel Core i7 13th Gen

Resolved by: Samsung India Customer Support (Email)

Resolution Date: March 24, 2026

• Rajesh Kondamudi, Madhira, Telangana, India

Answer 3

To give feedback to the development team use the Feedback Hub in windows.

Answer 4

The described issue matches a known, already investigated problem affecting some Samsung devices running Windows 11, versions 24H2 and 25H2, where access to the C: drive is lost with the error “C:\ is not accessible – Access denied” and many apps (including Outlook and system utilities) fail to start.

According to the documented investigation, Microsoft and Samsung determined that:

• The root cause is an issue in the Samsung Galaxy Connect app (also referred to as Samsung Continuity Service) that corrupts standard Windows permissions on the C: drive.
• The timing coincided with recent Windows security updates (for example KB5077181 and subsequent updates), but the issue is not caused by current or previous Windows monthly updates themselves.
• The problem has been observed on Samsung Galaxy Book4 and Samsung Desktop models, and NP750XGJ is explicitly listed among the affected models.

For recovery and mitigation, the documentation states:

1. The issue can be resolved by following the official recovery guidance in the Microsoft KB article “Recovery steps: Samsung Galaxy Connect or Samsung Continuity Service might cause loss of access to the C: drive”. These steps restore standard Windows permissions on affected devices.
2. Microsoft and Samsung jointly validated these recovery steps.
3. For device‑specific assistance beyond those steps, users should contact Samsung’s support channels.
4. Mitigations were implemented starting March 14, 2026 (Pacific Time) to prevent additional devices from encountering this issue. As part of these mitigations:
   • The affected Samsung Galaxy Connect application was temporarily removed from the Microsoft Store.
   • Samsung republished a stable previous version of the application to prevent recurrence.

Regarding the requests in the report:

• Step‑by‑step recovery: The requested step‑by‑step recovery guidance is provided in the referenced KB article, which is the official Microsoft recovery path for restoring C: drive permissions on affected Samsung devices.
• Recovery from WinRE / repair tool: The documentation does not describe a separate downloadable recovery tool beyond the KB’s recovery steps; it only states that the KB procedure restores standard Windows permissions.
• Compatibility block / safeguard hold: The documentation confirms that mitigations have already been applied, including removal of the problematic Galaxy Connect version from the Microsoft Store and republishing a stable version to prevent further impact.
• Data recovery guidance: The documentation confirms that the recovery steps restore standard Windows permissions, which is intended to restore access to the C: drive and applications. It does not provide additional detail on data‑recovery scenarios beyond that.

For a device in the described state, the next action is to follow the recovery procedure in “Recovery steps: Samsung Galaxy Connect or Samsung Continuity Service might cause loss of access to the C: drive” and, if further help is needed, work directly with Samsung support for device‑specific recovery.

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References:

• Windows 11, version 24H2 known issues and notifications
• Windows 11, version 25H2 known issues and notifications
• Resolved issues in Windows 11, version 24H2
• Resolved issues in Windows 11, version 25H2