Not all disk recovery services are created equal, but the basic process disk recovery services use is virtually identical from one company to the next. Disk recovery always begins with an evaluation. Your hard disk is turned over to the disk recovery service of your choice so that they can diagnose the problem and provide you with a quote for data recovery.
Once you approve the quote, the data recovery company copies all of the corrupted/damaged data onto a separate drive. This is done so that data is not further damaged and made irretrievable. Data companies sign confidentiality agreements so that you feel confident in their ability to keep your data private.
After all of your data has been recovered, it is usually returned to the original drive, which can then be returned to you. Occasionally data must be returned on writable disks or a new hard disk drive because the original drive is deemed irreparable. Most companies store recovered data for a short period of time in case there is a problem adding the data back to your system.
While the data disk recovery process is often similar from one company to another, certain companies succeed at recovering data when others fail. The use of proprietary recovery processes often means the difference between success and failure. Look for disk recovery services that spend the time, energy, and money researching and developing new techniques for finding and restoring data.