He will need to take out the HDD and take it to a Company who specialised in Forensic Data Recovery. Here they will do what is necessary to recover the data and will most likely destroy the existing HDD so make sure that everything on it is Backed up and transfered to the replacement HDD.
Unless you put a Priory request on this recovery it should take about 2 weeks depending on the current work load when the Drive hits the Data Recovery's House and the cost will vary depending on how much work is required to recover the data but if necessary every thing that has ever been written to that HDD can be recovered.
[b]But you need to contact the Recovery House First and make sure that they can do Forensic Recovery Work[/b] it might be an idea to ask for a guesstimate at the time as well because this is generally speaking quite expensive and time consuming for the business recovering the data but you should get some change out of $500,000.00 depending on how much work is required to recover what should have been saved originally.
Col