???My 40G hard drive has only 5.5 g free and when I have run scan disk in the past it did say I had some bad sectors. Should I replace (HELP) or can I use an external HDD alongside? If I use an external alongside can I use the external to load software and do pictures/video transfers or are they only any good for data storage? If I have to replace, is it as straight forward as say a new DVD rewriter that I have just replaced or do I have to give to a shop to do?