breakpo

Use: typedef MyData struct {     Data               string    `json:"data"`         FieldName   *int64   `json:"-"`  } Adding the `json:"-"` will make the Unmarshal command disregard this field

 You have to do the following steps: Run defrag in the guest (Windows only) Nullify free space: With a Linux Guest run this: dd if=/dev/zero of=/var/tmp/bigemptyfile bs=4096k ; rm /var/tmp/bigemptyfile Or: telinit 1 mount -o remount,ro /dev/sda1 zerofree -v /dev/sda1 With a Windows Guest, download SDelete from Sysinternals and run this: sdelete.exe c: -z (replace C: with the drive letter of the VDI) Shutdown the guest VM Now run VBoxManage's modifymedium command with the --compact option: With a Linux Host run this: vboxmanage modifymedium --compact /path/to/thedisk.vdi With a Windows Host run this: VBoxManage.exe modifymedium --compact c:\path\to\thedisk.vdi With a Mac Host run this: VBoxManage modifymedium --compact /path/to/thedisk.vdi This reduces the vdi size. https://superuser.com/questions/529149/how-to-compact-virtualboxs-vdi-file-size