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100% work. Unfortunately, storage is not infallible. All storage devices have the potential to break. From stress induced leakage for an SSD to a head crash and platter damage for a HDD, there are many problems that can affect our data on a storage device, even a faulty motherboard or memory can affect how our data is read and written.
When Macrium Reflect performs a backup, as the data is read from the source disk but before it is written to the destination, a hash is created for each block of data and stored in the index of the resultant image file. This hash is a unique string of characters that represents the data that is stored in that block. An image is considered corrupted if a new hash is generated for the block of data and it does not match the original hash that is stored in the index. This means that the data contained in the image is not the same as the data that was read from the source disk. This is known as a verification failure and the data has been corrupted.
The leading cause of a verification failure is a hardware fault. The most likely suspect is the storage media that the image is located on, however, memory and motherboard faults can also cause a verification error. For example, if your image is stored on a HDD, physical damage to the magnetic surface of the platter will affect how the data has been physically stored on the disk. This is similar to how a scratch on a CD may cause a song or part of a film to ‘skip’. When the CD player is unable to read from a broken track on the disk, it will skip to the next section of data it can read successfully. Unfortunately, due to the nature of backups, data integrity errors are much more problematic than for a song or film. We wouldn’t be happy with the restore process simply skipping unreadable data, as this data may contain important information to us or to the operating system and file systems we are restoring. This is why you will receive an error when attempting to restore an image where corruption is detected.
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