diff --git a/PVE/QemuConfig.pm b/PVE/QemuConfig.pm
index c2192cf1..6ba0cc3d 100644
--- a/PVE/QemuConfig.pm
+++ b/PVE/QemuConfig.pm
@@ -20,7 +20,7 @@ mkdir $confdir;
 my $lock_dir = "/var/lock/qemu-server";
 mkdir $lock_dir;
 
-my $MAX_UNUSED_DISKS = 8;
+my $MAX_UNUSED_DISKS = 256;
 
 # BEGIN implemented abstract methods from PVE::AbstractConfig
 
diff --git a/PVE/QemuServer.pm b/PVE/QemuServer.pm
index 1348e480..2f25c685 100644
--- a/PVE/QemuServer.pm
+++ b/PVE/QemuServer.pm
@@ -658,7 +658,7 @@ my $MAX_VIRTIO_DISKS = 16;
 my $MAX_SATA_DISKS = 6;
 my $MAX_USB_DEVICES = 5;
 my $MAX_NETS = 32;
-my $MAX_UNUSED_DISKS = 8;
+my $MAX_UNUSED_DISKS = 256;
 my $MAX_HOSTPCI_DEVICES = 4;
 my $MAX_SERIAL_PORTS = 4;
 my $MAX_PARALLEL_PORTS = 3;