Hi Andrew,
Dont panic! Panic is the enemy number one of data recovery.
Most important is not to try anything. Please dont start "what if I do this
and that?".
Data is not lost yet, but it may be if you do many wrong tries to recovery
it.
Stop, and think what are your options.
Do you have backups? None? One year old? Paper printings that can be scanned
or typed?
What exactly was lost? Can most be restored manually or not?
How import is your data? How much money you are ready to pay for recovery
services?
My advice depends on that variables.
If your data is critical, valuable, and there is no other way to restore it,
just power off your computer and contact professional data recovery
services. Data recovery labs can do miracles even on data rewritten several
times, laptops dropped on swimming pools, and worst, burned on fires and
under severe damage. Such recovery is never 100% guaranteed but the chances
are very good for the scenario you describe. Recovery may take some time,
but there are express and priority services. Professional services are
expensive to recovery less important data.
If your data was important to you and you dont have a backup, but it was
just ordinary stuff, some emails you can live without; some financial data
that may take a while to input again, but is not going to shut down your
business, then you may consider the data lost. Only if you can afford to
consider the data lost you can start to make any amateur attempts to
recovery. Do-it-yourself data recovery software sometimes fail and destroy
completly the last chances for a data recovery lab. But that's ok if you
think that the data is already lost and you dont want to pay expensive
services.
Any way, if I was you, my main concern would be "how can I prevent this from
happening again?", not "how am I gona get these files?". This may be an hard
lesson to start making backups.
Data recovery services (just to name a few, known):
http://www.ontrack.com/
http://www.drivesavers.com/
http://www.cbltech.com/
http://www.dataleach.com/
Data recovery software (not freeware, and do it at your own risk):
http://www.r-tt.com/
(see software under data recovery services web sites)
Best regards,
Mario