smart

One of our client, removed SATA Drive (WD 2TB) from NVR and connected it to Computer. Computer installed the driver first and then asked if it should initialize the hard drive. Client clicked yes and surveillance data was lost. I know there are similar posts in this forum. But I could not get a desired direction for data recovery. I will much appreciate guidance, before I hand over the sata to data recovery experts which is a damn costly affair warm regards / Smart Surveillance.