diff --git a/frontend/webadmin/modules/uicommonweb/src/main/java/org/ovirt/engine/ui/uicommonweb/models/storage/UploadImageModel.java b/frontend/webadmin/modules/uicommonweb/src/main/java/org/ovirt/engine/ui/uicommonweb/models/storage/UploadImageModel.java
index b95a142ab19..c3c75496a7a 100644
--- a/frontend/webadmin/modules/uicommonweb/src/main/java/org/ovirt/engine/ui/uicommonweb/models/storage/UploadImageModel.java
+++ b/frontend/webadmin/modules/uicommonweb/src/main/java/org/ovirt/engine/ui/uicommonweb/models/storage/UploadImageModel.java
@@ -21,6 +21,7 @@
 import org.ovirt.engine.core.common.businessentities.storage.TransferClientType;
 import org.ovirt.engine.core.common.businessentities.storage.TransferType;
 import org.ovirt.engine.core.common.businessentities.storage.VolumeFormat;
+import org.ovirt.engine.core.common.businessentities.storage.VolumeType;
 import org.ovirt.engine.core.compat.Guid;
 import org.ovirt.engine.core.compat.StringHelper;
 import org.ovirt.engine.ui.frontend.Frontend;
@@ -330,12 +331,18 @@ public boolean flush() {
             DiskImage diskImage = (DiskImage) getDiskModel().getDisk();
             diskImage.setSize(getVirtualSize());
             diskImage.setActualSizeInBytes(imageInfoModel.getActualSize());
-            diskImage.setVolumeFormat(diskModel.getIsIncrementalBackup().getEntity() ?
-                    VolumeFormat.COW : getImageInfoModel().getFormat());
-            diskImage.setVolumeType(AsyncDataProvider.getInstance().getVolumeType(
-                    diskImage.getVolumeFormat(),
-                    getDiskModel().getStorageDomain().getSelectedItem().getStorageType(), null, null));
-            diskImage.setContentType(getImageInfoModel().getContentType());
+            VolumeFormat volumeFormat = diskModel.getIsIncrementalBackup().getEntity() ?
+                    VolumeFormat.COW : getImageInfoModel().getFormat();
+            diskImage.setVolumeFormat(volumeFormat);
+            DiskContentType contentType = getImageInfoModel().getContentType();
+            if (volumeFormat != VolumeFormat.COW && contentType == DiskContentType.ISO) {
+                diskImage.setVolumeType(VolumeType.Preallocated);
+            } else {
+                diskImage.setVolumeType(AsyncDataProvider.getInstance().getVolumeType(
+                        volumeFormat,
+                        getDiskModel().getStorageDomain().getSelectedItem().getStorageType(), null, null));
+            }
+            diskImage.setContentType(contentType);
             return true;
         } else {
             setIsValid(false);