Gruvi was a short-lived memory card format compatible with microSD developed by Sandisk

SanDisk

SanDisk Corporation is an American multinational corporation that designs, develops and manufactures data storage solutions in a range of form factors using the flash memory, controller and firmware technologies. It was founded in 1988 by Dr. Eli Harari and Sanjay Mehrotra, non-volatile memory...

 in 2006. The cards were intended for the distribution of music and videos, and had a variety of special Digital rights management

Digital rights management

Digital rights management is a class of access control technologies that are used by hardware manufacturers, publishers, copyright holders and individuals with the intent to limit the use of digital content and devices after sale. DRM is any technology that inhibits uses of digital content that...

 features including the ability to pre-load content that could be 'unlocked' at a later date. The little cards featured a picture of the artist whose music was pre-loaded onto the card. Only a handful of Gruvi cards were ever released, one of them was the album A Bigger Bang

A Bigger Bang

A Bigger Bang is the 22nd British and 24th American studio album by The Rolling Stones, released on Virgin Records in September 2005. It is a follow-up to their previous full-length studio album Bridges to Babylon from 1997, that gap of eight years the longest between studio albums of the band's...

 by the Rolling Stones.

slotMusic

SanDisk repeated their attempt at a flash-media-based music distribution format in 2008, with the introduction of slotMusic

SlotMusic

slotMusic is a type of microSD memory card developed by SanDisk preloaded with music in MP3 format. They were first available at Wal-Mart and Best Buy stores in the United States in October 2008. The current selection of songs comes from Universal Music Group, Sony BMG, Warner Music Group and EMI...

, this time without DRM.