Many people do not understand the delicacy of the internal components of a hard drive. A hard drive should never be opened unless in a clean room environment. Inside the drive, there are platters which hold the data. These platters are made of either light aluminum alloy, glass or ceramic and are coated with a magnetizable substance.
This is an informative, yet small article on the cons of trying to recover data yourself. I tend to always run to recovery software, because I don’t consider any of my data so important that I would want to pay a professional to do it for me. HDD Saver points out why even using Recovery software can hurt your chances of data recovery.