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Error

Backup aborted! - Write operation failed - The request could not be performed because of an I/O device error

The following error may also be seen the the log:

Backup aborted! - Write operation failed - The system cannot find the file specified.

Description

This error is generated by the Windows operating system and is always caused by I/O (Input/Output) throughput issues with either the disk or the controller that it is attached to and may cause the backup drive to unexpectedly drop from Windows.

Ensure external disks are optimized for performance

External disks can be configured either for Performance or for Quick Removal. When configured for Quick Removal, Windows will disable write caching to the disk thereby slowing down throughput. All writes will go direct to the disk and throughput IO collisions can occur. It is recommended that external disks are configured for Performance when you encounter the 1117 error code. Follow these steps to configure the disk:

Click Start, click Run, type devmgmt.msc, and then click OK.
Alternatively, please see here: http://windows.microsoft.com/en-gb/windows/open-device-manager#1TC=windows-7
Expand 'Disk Drives'. Right-click the backup drive, and then click Properties
Click the Policies tab.
Click Optimize for performance, and then click OK.
Restart the computer

After restarting your computer we recommend trying another backup to see if this has resolved your issue.

Enable "File System Cache" on the backup target drive

Some systems may experience problems with "Direct Disk I/O" enabled, especially if there is a latent problem with the USB connection. First, check the quality of USB cables and connections and, if you have a USB hub, then try a direct connection. If that doesn't help then change the target drive to use "File System Cache" instead of "Direct Disk I/O"

Please try another backup when the above steps have been performed.