How to recoved data from a dvd ?

Software is probably not going to be much use if the DVD drive can't read the data. You will probably need to use a DVD repair kit which contains solutions for cleaning the disk and filling in (or minimising) the scratches with a liquid which has the same optical properties as the disk when it dries. These are expensive and probably not worth it for one DVD (when you might often buy a replacement much cheaper). Repair is quite a tricky process and not always successful, depending on the depth of the scratches. If they are very shallow surface damage, you can sometimes polish them out enough to make the disc readable by using a VERY fine abrasive (such as toothpaste or a Fuller's earth based metal polish). I have heard of people repairing CDs and DVDs with a suitably diluted clear nail varnish followed by careful polishing. This search shows a number of instruction sites on repairing DVDs: http://search.mylot.com/search.aspx?t=web&k=I+have+a+dvd+with+some+scratches+on