Lost Data

“Myth: I can recover the data myself
Fact: Do it yourself (DIY) projects can work especially if the hard drive has a logical failure of the file system. We however do not recommend this for Some reasons include like :The media has physical problems and running the software against the media made things worse; or, the software was run against the media and the recovered data was written back to the same media effectively destroying the data. Before you consider a DIY data recovery project call us for advice.”
- http://datarecovery.co.ke/myths-and-facts-about-data-recovery/

“A typical HDD design consists of a spindle that holds flat circular disks, also called platters, which hold the recorded data. The platters are made from a non-magnetic material, usually aluminum alloy, glass, or ceramic, and are coated with a shallow layer of magnetic material typically 10–20 nm in depth, with an outer layer of carbon for protection.”
- escotal.com