Super High Material CD

SHM-CD is a digital optical disc data storage manufacturing process. It is an improved compact disc product with the greatest change being a different polycarbonate material that allows more precise physical representation of stored bits during pressing and less laser scatter during reading. These improvements aim to facilitate playback by producing fewer errors and potentially better sound quality. SHM-CDs are played on a standard CD player.
This process was developed in Japan by Universal Music Japan and JVC and launched in 2007. The same material can also be used to manufacture SHM-SACD discs. A small percentage of CD releases are re-released as SHM-CDs each year to the current date.
SHM-CDs are visually identifiable by their innermost rings, which have the format's logo stamped across the circumference.
In 2013 Universal Music Japan introduced Platinum SHM-CDs, which replaced the normal aluminium layer in the CD with platinum, with claimed further advantages. Only a small number of albums have been released in this format.
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* [http://www.positive-feedback.com/Issue39/shmcd.htm SHM-CD: New and improved CD format from Japan!]

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