History
The Carbon was announced on August 2, 2004.
The first 500 Carbons were produced as a Limited Edition with a unique serial number (1-500) that was laser engraved into the polished steel (back) side of the player.
Rio officially exited the portable music player market in August 2005 and is no longer providing firmware updates for the players. The last officially released version of the firmware (1.95) supports subscription-based PlaysForSure licenses, and PlayForSure purchased licenses.
A previously unreleased version of Rio Carbon firmware, called "The Developer's Cut", was released in January 2006 by enthusiasts, and offers several new and updated features.
Read more about this topic: Rio Carbon