Generally speaking, 'the disk structure is corrupted and unreadable' is a hard drive issue that happens when the computer tries to access a partition that has a corrupted or unreadable disk structure, resulting in a failed attempt to access it.
So, I feel it is time to share my own experience with you. So, without any hesitated I just plugged out the external HD from the computer and when connected it back to the computer it said that the external HD is corrupted and unreadable.' After I done with the transferring, I tried to disconnect it but it said I can't because it's still in use. Here is a question quoted from Tomshardware: 'Recently, I bought a new computer and I connect my external hard drive to the computer. I also searched on the internet and found so many people discussing the same issue. Through several trying, I finally worked it out. Recently one of my friends asked me to help him remove ' the disk structure is corrupted and unreadable' error.
Issue: The Disk Structure Is Corrupted and Unreadable Check whether the Hard Drive Has Failed or Is Failing Solution 3: Recover Data from Unreadable Hard Drive and Reformat.Issue: The Disk Structure Is Corrupted and Unreadable.