All distros are sha/md5 checked against official values and are burnt to grade A media using Nero Linux 3.x.. If you are not satisfied with the goods and inform us within seven days of your receipt of the goods, In these cases a replacement will be sent free of charge and we are notified within 10 days of the customers receipt of the product Orders will be processed at our published prices, otherwise, in the case of any unexpected change in price, you will be informed and asked if you wish to reconsider your order before proceeding