Traduzione in corso passo 10
Let's erase it. (google translate: "format")
And then, let's try and clone it. This time though, we're going to choose what I believe is called a volume, rather than a device. The device being the stick of ram we just installed and a volume as the collection of files and metadata stored on it.
Chkdsk never hurt anyone. In Mac parlance, "Verify disk" under "First Aid"