Software⏱️ 4 min read📅 2026-06-11

How to Fix: Win7 x64 large copy File creation error - The semaphore timeout period has expired

Windows 7 x64 large file copy error, semaphore timeout period has expired.

Quick Answer: Try using the /B switch with xcopy to resume the transfer from where it left off.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🔧 Proven Troubleshooting Steps
  3. 🎯 Final Words

The 'semaphore timeout period has expired' error occurs when Windows is unable to create or access a file due to a lack of available resources, such as disk space or memory. This issue affects users who are trying to copy large files from one storage device to another.

This frustrating error can be particularly challenging to resolve, especially for those who have tried various methods without success. In this guide, we will walk you through the root causes of this error and provide two primary fix methods to help you overcome it.

💡 Why You Are Getting This Error

  • The semaphore timeout period has expired due to a lack of available disk space or memory on the destination drive. When Windows tries to create a new file, it requires a certain amount of free space on the destination drive to complete the operation. If this space is not available, the semaphore timeout period expires, resulting in an error.
  • Another possible reason for this error is that the source and destination drives are connected via different USB ports, which can cause issues with disk access and communication between Windows and the storage devices.

🔧 Proven Troubleshooting Steps

Using a Different USB Port

  1. Step 1: Disconnect all other USB devices from your computer to ensure that only the source and destination drives are connected.
  2. Step 2: Try copying the large file again using the same method (xcopy /J). If the error persists, proceed to the next step.
  3. Step 3: If you are still experiencing issues, try disconnecting both drives and reconnecting them one at a time to see if the problem is specific to either drive.

Increasing Available Disk Space

  1. Step 1: Check the available free space on the destination drive by right-clicking on the drive in File Explorer, selecting 'Properties', and then checking the 'Free space' column.
  2. Step 2: If the available free space is less than 10% of the total capacity, it may be causing the semaphore timeout period to expire. In this case, you can try deleting unnecessary files or expanding the partition size on the destination drive (if possible).
  3. Step 3: Alternatively, you can try using a different file copy method that does not rely on disk space, such as using rsync or a third-party file copying tool.

🎯 Final Words

To resolve the 'semaphore timeout period has expired' error when copying large files from one storage device to another, try disconnecting all other USB devices and reconnecting only the source and destination drives. If this does not work, check the available free space on the destination drive and consider increasing it or using a different file copy method.

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