Though they do happen, verification errors are extremely rare. We estimate that less than 1 in 1,000 systems have problems that lead to image file corruption. The vast majority of Macrium Reflect users will never encounter a single verification issue.
This article explains what happens during the image verification process and how to troubleshoot problems with your system.
Quite simply, it means that data that was written to the backup or image file is not the same as is read back from the same file.
Errors of this type are symptomatic of a computer system with a marginal hardware problem. The most likely suspect is your backup media - but memory and motherboard faults can also cause this issue.
You do, you just haven't noticed it yet. If your PC can't write and read back data reliably then this won't just be a problem with Macrium Reflect, all software on your PC will be vulnerable to same problem. Macrium Reflect is either the first to trigger it or is the only software reporting the problem to you.
Files are not checked for integrity by Windows, so unless an application does it explicitly, disk errors could have been occurring silently. Macrium Reflect handles very large volumes of data with a consequently high chance of triggering any intermittent hardware errors.
To independently corroborate the problem you can use a third party utility to show the same corruption:
Note: The DOS copy command and ExactFile checks aren't conclusive as file checkers read the file sequentially and the error may only occur during random access. Due to the different execution and data paths, success in any of the detail test is not an absolute guarantee that your hardware is fault free.
The key to resolving verification errors is to locate the source of the corruption. This can be very difficult and may involve replacing PC components or upgrading firmware or software drivers.
If the backup drive is an external drive then backup to the same drive using a different PC. If your system is generally stable then the issue causing the verification error may have very low probability of occuring. Therefore, to optimise the chance of triggering it, you should try to backup the same or a greater volume of data. If you still receive verification errors then your drive is faulty and you should use a different backup device.
If possible try using a different sata or usb leads or connecting the device to a different port. Also, if using USB, try removing any USB hubs between the storage device and the computer.
Try combinations USB/Fire-wire/eSata/Network. If you only get corruption with one of the connection types then that sub-system has a problem. Updating the firmware or software drivers for the controller might resolve the problem.
Also, try connecting directly to a USB port with high a quality USB cable. USB hubs can often be a source of corruption.
If the error can't be traced to a single component then you may have faulty system RAM. If you have more than one RAM module installed then swapping out the memory can isolate the faulty RAM module.
Note: Memory checkers such as 'memtest86' will often fail to find any problems even though there is a latent issue with the RAM.
We have had an uncorroborated report that some anti-virus software can corrupt disk writes. If you find that your images pass verification after disabling your AV software then we strongly recommend that you un-install your AV software as it is compromising your system.
Verifying image and backup files
Verifying image and backup files from the command line