diff --git a/src/qemu/qemu_domain.c b/src/qemu/qemu_domain.c
index 162be7e982..25dc4412c0 100644
--- a/src/qemu/qemu_domain.c
+++ b/src/qemu/qemu_domain.c
@@ -6642,8 +6642,7 @@ qemuDomainDeviceDiskDefPostParse(virDomainDiskDefPtr disk,
 
     /* default disk format for drives */
     if (virDomainDiskGetFormat(disk) == VIR_STORAGE_FILE_NONE &&
-        (virDomainDiskGetType(disk) == VIR_STORAGE_TYPE_FILE ||
-         virDomainDiskGetType(disk) == VIR_STORAGE_TYPE_BLOCK))
+        virDomainDiskGetType(disk) != VIR_STORAGE_TYPE_VOLUME)
         virDomainDiskSetFormat(disk, VIR_STORAGE_FILE_RAW);
 
     /* default disk format for mirrored drive */
diff --git a/tests/qemuxml2argvdata/disk-network-gluster.args b/tests/qemuxml2argvdata/disk-network-gluster.args
index 9952402d92..1538df9068 100644
--- a/tests/qemuxml2argvdata/disk-network-gluster.args
+++ b/tests/qemuxml2argvdata/disk-network-gluster.args
@@ -26,7 +26,7 @@ if=none,id=drive-virtio-disk0 \
 -device virtio-blk-pci,bus=pci.0,addr=0x3,drive=drive-virtio-disk0,\
 id=virtio-disk0,bootindex=1 \
 -drive 'file=gluster+unix:///Volume2/Image?socket=/path/to/sock,file.debug=4,\
-if=none,id=drive-virtio-disk1' \
+format=raw,if=none,id=drive-virtio-disk1' \
 -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk1,\
 id=virtio-disk1 \
 -drive file.driver=gluster,file.volume=Volume3,file.path=Image.qcow2,\
diff --git a/tests/qemuxml2argvdata/disk-network-gluster.x86_64-2.12.0.args b/tests/qemuxml2argvdata/disk-network-gluster.x86_64-2.12.0.args
index a904ff5c70..c463db0ed5 100644
--- a/tests/qemuxml2argvdata/disk-network-gluster.x86_64-2.12.0.args
+++ b/tests/qemuxml2argvdata/disk-network-gluster.x86_64-2.12.0.args
@@ -29,7 +29,7 @@ if=none,id=drive-virtio-disk0 \
 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x2,drive=drive-virtio-disk0,\
 id=virtio-disk0,bootindex=1 \
 -drive 'file=gluster+unix:///Volume2/Image?socket=/path/to/sock,file.debug=4,\
-if=none,id=drive-virtio-disk1' \
+format=raw,if=none,id=drive-virtio-disk1' \
 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x3,drive=drive-virtio-disk1,\
 id=virtio-disk1 \
 -drive file.driver=gluster,file.volume=Volume3,file.path=Image.qcow2,\
diff --git a/tests/qemuxml2argvdata/disk-network-gluster.x86_64-latest.args b/tests/qemuxml2argvdata/disk-network-gluster.x86_64-latest.args
index a4e968b917..9b99db8715 100644
--- a/tests/qemuxml2argvdata/disk-network-gluster.x86_64-latest.args
+++ b/tests/qemuxml2argvdata/disk-network-gluster.x86_64-latest.args
@@ -29,7 +29,7 @@ if=none,id=drive-virtio-disk0 \
 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x2,drive=drive-virtio-disk0,\
 id=virtio-disk0,bootindex=1 \
 -drive 'file=gluster+unix:///Volume2/Image?socket=/path/to/sock,file.debug=4,\
-if=none,id=drive-virtio-disk1' \
+format=raw,if=none,id=drive-virtio-disk1' \
 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x3,drive=drive-virtio-disk1,\
 id=virtio-disk1 \
 -drive file.driver=gluster,file.volume=Volume3,file.path=Image.qcow2,\
diff --git a/tests/qemuxml2argvdata/disk-network-iscsi.args b/tests/qemuxml2argvdata/disk-network-iscsi.args
index 45da3a9de9..3cd3b5e03e 100644
--- a/tests/qemuxml2argvdata/disk-network-iscsi.args
+++ b/tests/qemuxml2argvdata/disk-network-iscsi.args
@@ -31,7 +31,8 @@ if=none,id=drive-virtio-disk1 \
 -device virtio-blk-pci,bus=pci.0,addr=0x5,drive=drive-virtio-disk1,\
 id=virtio-disk1 \
 -drive file=iscsi://myname:AQCVn5hO6HzFAhAAq0NCv8jtJcIcE+HOBlMQ1A@example.org:\
-6000/iqn.1992-01.com.example%3Astorage/1,if=none,id=drive-virtio-disk2 \
+6000/iqn.1992-01.com.example%3Astorage/1,format=raw,if=none,\
+id=drive-virtio-disk2 \
 -device virtio-blk-pci,bus=pci.0,addr=0x6,drive=drive-virtio-disk2,\
 id=virtio-disk2 \
 -drive file=iscsi://myname:AQCVn5hO6HzFAhAAq0NCv8jtJcIcE+HOBlMQ1A@example.org:\
diff --git a/tests/qemuxml2argvdata/disk-network-iscsi.x86_64-2.12.0.args b/tests/qemuxml2argvdata/disk-network-iscsi.x86_64-2.12.0.args
index e298220e09..4b648a985d 100644
--- a/tests/qemuxml2argvdata/disk-network-iscsi.x86_64-2.12.0.args
+++ b/tests/qemuxml2argvdata/disk-network-iscsi.x86_64-2.12.0.args
@@ -40,7 +40,7 @@ data=9eao5F8qtkGt+seB1HYivWIxbtwUu6MQtg1zpj/oDtUsPr1q8wBYM91uEHCn6j/1,\
 keyid=masterKey0,iv=AAECAwQFBgcICQoLDA0ODw==,format=base64 \
 -drive file.driver=iscsi,file.portal=example.org:6000,\
 file.target=iqn.1992-01.com.example:storage,file.lun=1,file.transport=tcp,\
-file.user=myname,file.password-secret=virtio-disk2-secret0,if=none,\
+file.user=myname,file.password-secret=virtio-disk2-secret0,format=raw,if=none,\
 id=drive-virtio-disk2 \
 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk2,\
 id=virtio-disk2 \
diff --git a/tests/qemuxml2argvdata/disk-network-iscsi.x86_64-latest.args b/tests/qemuxml2argvdata/disk-network-iscsi.x86_64-latest.args
index e7cc4cd1fd..be9ab18314 100644
--- a/tests/qemuxml2argvdata/disk-network-iscsi.x86_64-latest.args
+++ b/tests/qemuxml2argvdata/disk-network-iscsi.x86_64-latest.args
@@ -40,7 +40,7 @@ data=9eao5F8qtkGt+seB1HYivWIxbtwUu6MQtg1zpj/oDtUsPr1q8wBYM91uEHCn6j/1,\
 keyid=masterKey0,iv=AAECAwQFBgcICQoLDA0ODw==,format=base64 \
 -drive file.driver=iscsi,file.portal=example.org:6000,\
 file.target=iqn.1992-01.com.example:storage,file.lun=1,file.transport=tcp,\
-file.user=myname,file.password-secret=virtio-disk2-secret0,if=none,\
+file.user=myname,file.password-secret=virtio-disk2-secret0,format=raw,if=none,\
 id=drive-virtio-disk2 \
 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x5,drive=drive-virtio-disk2,\
 id=virtio-disk2 \
diff --git a/tests/qemuxml2argvdata/disk-network-nbd.args b/tests/qemuxml2argvdata/disk-network-nbd.args
index df4436b027..4abff25a0e 100644
--- a/tests/qemuxml2argvdata/disk-network-nbd.args
+++ b/tests/qemuxml2argvdata/disk-network-nbd.args
@@ -24,7 +24,8 @@ server,nowait \
 -drive file=nbd:example.org:6000,format=raw,if=none,id=drive-virtio-disk0 \
 -device virtio-blk-pci,bus=pci.0,addr=0x3,drive=drive-virtio-disk0,\
 id=virtio-disk0,bootindex=1 \
--drive file=nbd:example.org:6000:exportname=bar,if=none,id=drive-virtio-disk1 \
+-drive file=nbd:example.org:6000:exportname=bar,format=raw,if=none,\
+id=drive-virtio-disk1 \
 -device virtio-blk-pci,bus=pci.0,addr=0x4,drive=drive-virtio-disk1,\
 id=virtio-disk1 \
 -drive 'file=nbd://[::1]:6000,format=raw,if=none,id=drive-virtio-disk2' \
diff --git a/tests/qemuxml2argvdata/disk-network-nbd.x86_64-2.12.0.args b/tests/qemuxml2argvdata/disk-network-nbd.x86_64-2.12.0.args
index 330aadea4b..86bde153ee 100644
--- a/tests/qemuxml2argvdata/disk-network-nbd.x86_64-2.12.0.args
+++ b/tests/qemuxml2argvdata/disk-network-nbd.x86_64-2.12.0.args
@@ -27,7 +27,8 @@ file=/tmp/lib/domain--1-QEMUGuest1/master-key.aes \
 -drive file=nbd:example.org:6000,format=raw,if=none,id=drive-virtio-disk0 \
 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x2,drive=drive-virtio-disk0,\
 id=virtio-disk0,bootindex=1 \
--drive file=nbd:example.org:6000:exportname=bar,if=none,id=drive-virtio-disk1 \
+-drive file=nbd:example.org:6000:exportname=bar,format=raw,if=none,\
+id=drive-virtio-disk1 \
 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x3,drive=drive-virtio-disk1,\
 id=virtio-disk1 \
 -drive 'file=nbd://[::1]:6000,format=raw,if=none,id=drive-virtio-disk2' \
diff --git a/tests/qemuxml2argvdata/disk-network-nbd.x86_64-latest.args b/tests/qemuxml2argvdata/disk-network-nbd.x86_64-latest.args
index f7e8502385..85452e715a 100644
--- a/tests/qemuxml2argvdata/disk-network-nbd.x86_64-latest.args
+++ b/tests/qemuxml2argvdata/disk-network-nbd.x86_64-latest.args
@@ -27,7 +27,8 @@ file=/tmp/lib/domain--1-QEMUGuest1/master-key.aes \
 -drive file=nbd:example.org:6000,format=raw,if=none,id=drive-virtio-disk0 \
 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x2,drive=drive-virtio-disk0,\
 id=virtio-disk0,bootindex=1 \
--drive file=nbd:example.org:6000:exportname=bar,if=none,id=drive-virtio-disk1 \
+-drive file=nbd:example.org:6000:exportname=bar,format=raw,if=none,\
+id=drive-virtio-disk1 \
 -device virtio-blk-pci,scsi=off,bus=pci.0,addr=0x3,drive=drive-virtio-disk1,\
 id=virtio-disk1 \
 -drive 'file=nbd://[::1]:6000,format=raw,if=none,id=drive-virtio-disk2' \
diff --git a/tests/qemuxml2xmloutdata/disk-network-gluster.xml b/tests/qemuxml2xmloutdata/disk-network-gluster.xml
index ae2899040f..2c7c46b013 100644
--- a/tests/qemuxml2xmloutdata/disk-network-gluster.xml
+++ b/tests/qemuxml2xmloutdata/disk-network-gluster.xml
@@ -23,7 +23,7 @@
       <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
     </disk>
     <disk type='network' device='disk'>
-      <driver name='qemu'/>
+      <driver name='qemu' type='raw'/>
       <source protocol='gluster' name='Volume2/Image'>
         <host transport='unix' socket='/path/to/sock'/>
       </source>
diff --git a/tests/qemuxml2xmloutdata/disk-network-iscsi.xml b/tests/qemuxml2xmloutdata/disk-network-iscsi.xml
index b089b2950d..f1348d583e 100644
--- a/tests/qemuxml2xmloutdata/disk-network-iscsi.xml
+++ b/tests/qemuxml2xmloutdata/disk-network-iscsi.xml
@@ -31,7 +31,7 @@
       <address type='pci' domain='0x0000' bus='0x00' slot='0x05' function='0x0'/>
     </disk>
     <disk type='network' device='disk'>
-      <driver name='qemu'/>
+      <driver name='qemu' type='raw'/>
       <auth username='myname'>
         <secret type='iscsi' usage='mycluster_myname'/>
       </auth>
diff --git a/tests/qemuxml2xmloutdata/disk-network-nbd.xml b/tests/qemuxml2xmloutdata/disk-network-nbd.xml
index bb4223a3f0..818e8d7d7c 100644
--- a/tests/qemuxml2xmloutdata/disk-network-nbd.xml
+++ b/tests/qemuxml2xmloutdata/disk-network-nbd.xml
@@ -23,7 +23,7 @@
       <address type='pci' domain='0x0000' bus='0x00' slot='0x03' function='0x0'/>
     </disk>
     <disk type='network' device='disk'>
-      <driver name='qemu'/>
+      <driver name='qemu' type='raw'/>
       <source protocol='nbd' name='bar'>
         <host name='example.org' port='6000'/>
       </source>