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Product: Dual Layer DVDs it has only been in the last few years that many digitization projects have taken a serious approach to digital preservation. In that time CD-R has quickly become the most common media for preserving digital images, with more recently a move towards DVD-R due to the additional space that it offers. The popularity of both these media is largely due to their ease of use and low cost. However during this time, there has been a steady flow of worrying reports of 'lost data' or 'unreadable disks', which has lead to the reliability of laser-burnt media being questioned. Much of this worry has been centered on the choice of disc manufacturer and the construction method used to create the disc. Of course a project should always buy the best and most reliable discs it can find, however, it should be remembered that loss of digital data stored on CD-R and DVD-R is far more likely to be caused by bad writing (burning) or storage rather than by badly manufactured discs in the first place. CD-R and DVD-R can provide reliable back up at a reasonable cost as long as great care and attention is paid to burning them and storing them correctly. To ensure reliability of discs in the long-term, it is imperative to follow a few 'best practice' steps when burning CD-R and DVD-R discs.