jQuery Grid Plugin - jqGrid

In order to select  current row, i will need an id but i dont want it to be displayed in my table, how to hide it, Here is my full code

var i=0;
var filesystem=[];
$(xml).find('file').each(function(){ 
var row={};
row.id=i++;
row.total=$(this).attr('total');
row.free=$(this).attr('free');
row.used=$(this).attr('used');
row.percentage=$(this).attr('percentage');
filesystem.push(row);
});

$('#detailTable').empty();
$('<div width="100%">')
.attr('id','diskUsageSpan')
.html('<divclass="titleBlue">Configuration&gt;System&gt;Disk Usage</div>'+
'<table id="list1" width="100%"></table>'+
'<div id="gridpager"></div>'+
'</div>')        
.appendTo('#detailTable');    

jQuery("#list1").jqGrid({
datatype: "clientSide",
height: 250,
colNames:['id','Total Space','Free Space', 'Used Space', 'Used Percentage'],
colModel:[
{name:'id',index:'id', width:90, align:"right"},
{name:'total',index:'total', width:90, align:"right"},
{name:'free',index:'free', width:90, align:"right"},
{name:'used',index:'used', width:90, align:"right"},
{name:'percentage',index:'percentage', width:120, align:"right"}
],
pagination:true,
pager : '#gridpager',
rowNum:10,
scrollOffset:0,
height: 'auto',
autowidth:true,
viewrecords: true,
gridview: true,
edit:false,
add:false,
del:false

});

for(var i=0;i<filesystem.length;i++)
jQuery("#list1").jqGrid('addRowData',i+1,filesystem[i]);

jQuery("#list1").setGridParam({rowNum:10}).trigger("reloadGrid");