Accidentally erase my iMac from Find my iPhone App

Question

I accidentally erase my iMac from Find my iPhone App.,
Is it able to recover by target disk mode?
What is erase method of this function? Normal erase or Secure erase?

Answer 1

I solved the problem by follow Matt's suggestion.
I can (almost) recovered all my files with deep scan option in the program Data Rescue.
But it is restructured form, jpeg pictures are moved in one folders then you have to manually arrange them again.
Anyway, better than nothing
In conclusion, if you accidentally erase your iMac with Find my iPhone app.
1. iMac harddisk will be format, not securely, you can recover them.
2. You need 2 computers, and one thunderbolt cable. (Firewire in the older model)
3. Using Target Disk Mode (press T while booting, after the signal) at the source computer.
4. Data Rescue (or other recovery software) need to installed in another computer
5. Use "Deep Scan" method, it will takes like 7 hrs to scan 1TB harddisk
6. The files that recovered will be unstructured, (the one that structured is not working)
7. You might need the larger capacity harddisk than the one you recovering. (in this case 1.5TB or 2TB)
8. It will takes another 4-6 hours in recovering files.