diff --git a/www/manager/openvz/RessourceEdit.js b/www/manager/openvz/RessourceEdit.js
index 1cb32178..4d3321df 100644
--- a/www/manager/openvz/RessourceEdit.js
+++ b/www/manager/openvz/RessourceEdit.js
@@ -38,7 +38,9 @@ Ext.define('PVE.openvz.RessourceInputPanel', {
 	    {
 		xtype: 'numberfield',
 		name: 'disk',
-		minValue: 0.5,
+		minValue: 0.001,
+		maxValue: 128*1024,
+		decimalPrecision: 3,
 		value: '4',
 		step: 1,
 		fieldLabel: gettext('Disk size') + ' (GB)',
diff --git a/www/manager/qemu/HDEdit.js b/www/manager/qemu/HDEdit.js
index 03b145d8..004a222d 100644
--- a/www/manager/qemu/HDEdit.js
+++ b/www/manager/qemu/HDEdit.js
@@ -165,8 +165,9 @@ Ext.define('PVE.qemu.HDInputPanel', {
 
 	    me.hdsizesel = Ext.createWidget('numberfield', {
 		name: 'disksize',
-		minValue: 1,
+		minValue: 0.001,
 		maxValue: 128*1024,
+		decimalPrecision: 3,
 		value: '32',
 		fieldLabel: gettext('Disk size') + ' (GB)',
 		allowBlank: false