External hard drive lost data after creating factory recovery

I have recently created a factory/system recovery on my Samsung m3 external hard drive with 1.5tb, however after I created the factory recovery on my hard drive total memory went from 1.5tb to 50gb with the new files.

Is there a way to get the memory space back? I don't really care about the deleted data.

I have used the dell software that came with my laptop to create the recovery
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More about external hard drive lost data creating factory recovery
  1. Stop using the drive any further. Try to use "RECUVA" on the drive.
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