title: Persistent disk losing some data
body: <p>I have a question regarding GCP Persistent Disk (SSD). I created a disk, I created a VM to which I added the disk. Then I ssh'd into the VM, I saw the disk, I formatted it and mounted it to my VM. Everything worked just fine, I was able to create some files there and use it as a normal disk. However, when I deleted the VM and created another VM some time later, mounted the same disk, the data seemed to be lost, I didn't see it.<br />
  This contradicts the name &quot;persistent&quot; which means I might be doing something wrong or misunderstanding something. I would be greateful for any help.</p>