"The team did a great job on recovering my precious family photos from a degraded drive, it was however very expensive and i am not sure that the cost is warranted, this said i would have paid whatever the cost to recover the photos. Life lesson learned ......ALWAYS BACK UP !!!"
Your drive had sustained a head crash after a power outage causing unreadable sectors. With over 5.84Billion sectors to recover the unreadable few hundred had no detrimental effect on the less than 10% capacity used.
For those reading it is a good idea never to fill a drive to more than 90% of its stated capacity. This means that the drive life can be extended and in the event of a recovery the possibility of a specific data being too damaged to recover.