Hi everyone, This post is similar to https://forum.proxmox.com/threads/boot-failed-not-a-bootable-disk.39301/ and https://forum.proxmox.com/threads/boot-failed-not-a-bootable-disk.11788/ These forum post are unresolved. I have a VM running Linux Centos 6.7, 64-bit. 4GB RAM, and only a 32GB of disk. The mainly usage is to relay internal mails to Internet , using Sendmail-SMTP. Yesterday was installed some antispam protections (MailScanner from mailscanner.info) Apparently the installation process intensively writes the hard disk with multiple small files. Once installed, there is approximately 500 mb more in the file system. I restarted the virtual machine to make sure the service was installed correctly. But when restarting, the machine presented the error "Boot failed: not a bootable disk" I remember that in previous versions of Proxmox there were tools to analyze qemu images. But currently in this Proxmox 5.2-1, how to identify the type of file - if it is qemu or if it is another format? And with what tools can it be repaired?