====== VirtualBox (Virtual Machines, VMs) ======
//see also: [[:de:admin:virtualbox|VirtualBox 🇩🇪]]//

===== Making VMs faster on CoW file systems =====

<code bash>chattr -R +C ./VirtualBox VMs/</code>

===== saving space with Windows 10 guest =====
  * [[https://docs.microsoft.com/en-us/sysinternals/downloads/sdelete|Sysinternals']]''sdelete -z C:''
  * ''VBoxManage modifyhd somedisk.vdi --compact''
    * if error "cannot register the hard disk … because a hard disk … with UUID … already exists":\\ ''VBoxManage modifymedium disk {938781e0-65f5-46de-a656-8118cf761cdb} --compact''

===== Troubleshooting =====

==== E_ACCESSDENIED ====

''.vbox'' File in the VM folder in ''VirtualBox VMs'' could be empty or inaccessible, maybe rename ''.vbox-prev'' file to ''.vbox'' to fix.