8.1.1 Introduction

8.1.1.1  Recordable CD (CD-R) and recordable DVD (DVD-R/+R), have become integral in the recording and distribution of many types of audio and audio-visual materials. Though the CD and DVD are now only one of many types of more affordable and reliable storage technologies, the format remains popular for many reasons, amongst them their ease of use and common familiarity. The CD was initially marketed as the perfect permanent carrier, but this was soon shown not to be the case when many of the early discs failed. Even though subsequent technological development has improved on many of the early manufacturing faults, no credible claim can be made to permanence. In fact, digital archiving experts commonly acknowledge that no carrier is permanent.Instead,the processes of acquiring data, transferring to storage systems and managing and maintaining the data, and providing access and ensuring the integrity of the stored information, presents a new range of risks that must be managed to ensure that the benefits of digital preservation and archiving are realised. Failure to manage these risks appropriately may result in significant loss of data value and content.

8.1.1.2  Recordable CDs and DVDs are often chosen as archival carriers, however, the risk of failure of a storage system based on this type technology is high when compared to other approaches. An integrated digital mass storage system with suitable digital repository management software is recognised as the most appropriate for the long term sustainability of data. There may, however, be circumstances where a collection curator may make a decision to use optical disc for storage.

8.1.1.3  Bearing in mind these constraints, it is possible to use recordable optical disks as reliable carriers for a short period of time providing the following recommendations are carefully adhered to.