Hardware⏱️ 4 min read📅 2026-06-19

How to Fix: Finder Error -36 with Console I/O Error - potential causes?

Technical issue with Finder Error -36 and Console I/O Error -36, potential causes related to heat and drive reliability.

Quick Answer: Check drive temperatures and consider using a cooling solution or replacing the drives if they're old or failing.

📋 Table of Contents

  1. 💡 Why You Are Getting This Error
  2. 🔧 Proven Troubleshooting Steps
  3. ✨ Wrapping Up

Finder Error -36 is an indication of a problem with data transfer between two hard drives. This error can occur in systems running macOS, and it's often linked to I/O Errors coming from the kernel. The issue at hand involves copying large amounts of data between two hard drives: an OWC Mercury Elite portable RAID (the target) and a G-Technology G-Drive Mobile (the source). Both devices are connected via FireWire 800 in a chain configuration, with the OWC drive positioned centrally.

This problem can be frustrating because it prevents data transfer between these two critical storage devices. However, by following this troubleshooting guide, you will be able to identify and potentially resolve the cause of this issue.

💡 Why You Are Getting This Error

  • The source hard drive (G-Technology G-Drive Mobile) is overheating, causing I/O Errors that propagate to the Finder Error -36 codes. This scenario can arise due to improper cooling or inadequate airflow around the device.
  • There's a problem with one of the drives in the FireWire 800 chain, leading to data transfer issues and resulting in Finder Error -36. Chaining two devices together can increase the risk of such errors if not properly configured.

🔧 Proven Troubleshooting Steps

Optimize Cooling and Verify Chaining Configuration

  1. Step 1: Ensure that the OWC Mercury Elite portable RAID has adequate airflow around it by adjusting its position or adding a fan for better cooling. This step can help prevent overheating, which might be contributing to the I/O Errors.
  2. Step 2: Verify the FireWire 800 chaining configuration and ensure that both drives are properly connected and configured. Check for any signs of physical damage or wear on the cables or connectors.
  3. Step 3: Test the system with a different drive in the middle of the chain to isolate if the issue is indeed related to the specific configuration.

Check Drive Health and Perform Data Validation

  1. Step 1: Run a thorough diagnostic check on both hard drives using built-in macOS tools or third-party software. This can help identify any issues with individual drives that might be causing data transfer problems.
  2. Step 2: Verify the integrity of the source drive by performing data validation checks, such as verifying file checksums or running a disk repair tool like Disk Utility's 'First Aid' feature.

✨ Wrapping Up

To resolve Finder Error -36 and I/O Errors related to copying data between hard drives, it is essential to first optimize cooling around the source drive and verify the FireWire 800 chaining configuration. If these steps do not resolve the issue, checking the health of individual drives and performing data validation will be necessary to ensure that your data is safe and can be transferred reliably.

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