formats/PSDriveUsage.format.ps1xml

<?xml version="1.0" encoding="utf-8" ?>
<Configuration>
    <ViewDefinitions>
        <View>
            <Name>default</Name>
            <ViewSelectedBy>
                <TypeName>PSDriveUsage</TypeName>
            </ViewSelectedBy>
            <CustomControl>
                <CustomEntries>
                    <CustomEntry>
                        <CustomItem>
                             <ExpressionBinding>
                                <PropertyName>Computername</PropertyName>
                            </ExpressionBinding>
                             <NewLine/>
                             <ExpressionBinding>
                                <ScriptBlock>
                                    $_.Drives | foreach-object { " $_"} | Out-String
                                </ScriptBlock>
                            </ExpressionBinding>
                          </CustomItem>
                    </CustomEntry>
                </CustomEntries>
            </CustomControl>
        </View>
    </ViewDefinitions>
</Configuration>