The error code 0xc00000e9 points towards a hard disk problem. You may see this error code when you try to install any version of the Windows operating system or even after the operating system has been installed. The error message would show message like, ‘Recovery, There was a problem with a device Connected to your PC’. Further, it would read, ’An Unexpected I/O Error has occurred, Error code:0xc00000e9’.

Common Causes for Error Code 0XC00000E9

There can be more than one reason for the error code 0xc00000e9 Unexpected I/O to happen. However, here are some of the most common reasons, why you may see this error on your screen.


  • Faulty or damaged hard disk.
  • Loosely connected hard disk.
  • Faulty USB or DVD that you use as your installation device.
  • Windows updates.
  • Misconfigured or corrupt registry files.
  • Outdated PC drivers.



Solution 1: Basic Troubleshooters

  1. Check if all the devices are connected to the computer
  2. Double check the connection if you are installing the operating system using a bootable disk or DVD
  3. Check the connection of the HDD or SSD and see it’s all plugged in properly
  4. Check if the hardware drivers are up to date
  5. If you are able to boot the PC, then download Driver Agent and install it.
  6. Scan the computer and see if the any connected device on the system need the drivers updated
  7. If it is showing any outdated drivers, immediately update the same
  8. Check if the error is now resolved.

Solution 2: Check for Corrupt Registry Or System Files

  1. Use Total System Care and check for any registry issues
  2. Scan the PC and rule out the possibility of errors
  3. If there are any issues found, fix it and check if the error is now resolved


Solution 3 – Run Disk Check

  1. Insert the operating system installation disk in the appropriate drive
  2. Restart the computer and boot from the installation disk
  3. Select the preferred language
  4. Click to repair the computer
  5. Select the operating system you want repaired
  6. Click to open Command Prompt under, ‘System Recovery Options’ menu
  7. Type, ‘chkdsk/f’ in the prompt and hit Enter
  8. Let the scan finish and then check if the error has resolved

Note: You can lose files with the disk check tool, therefore it is important to backup files before you proceed.

Solution 4 – Change Bios Settings

  1. Start or restart the computer
  2. Pres F2, DEL or F10 and go to BIOS settings
  3. Select, ‘Load Optimal Defaults’
  4. Navigate to computer hard disk setting configuration under, ‘Advanced’ section. Configure the setting to either AHCI or IDE
  5. Save the settings and reboot the computer and check if the error is resolved

Solution 5 – System Restore

  1. Go to ‘View Advanced Options
  2. Click on ‘System Restore’
  3. Pick a past date when the computer worked without any issues
  4. Click on the date
  5. Let it run completely and check if the error is resolved.