SAN JOSE, Calif. – SD memory cards will triple their data rates to 312 Mbytes/second thanks to a new UHS-II bus interface announced today by the SD Association. The group also announced a specification for distributing e-book applications on SD cards.
The new capabilities are described in the SD 4.00 specification being released to the group's membership before April.
The UHS-II interface triples current data transfer speeds, using signals assigned to the second row of pins on UHS-II SDXC and SDHC memory cards. It does not change the form factor of the cards and will be available in full-size SDHC and SDXC and smaller microSDHC and microSDXC cards.
The Ultra High Speed bus was announced in June 2010 and delivers speeds of 104 Mbytes/s. The UHS-II bus is backwards compatible with the original interfaces.
“We’ve tripled bus-interface speeds from last year’s UHS-I development, and we plan to double UHS-II speeds in the future,” said Norm Frentz, chairman of the SD Association, speaking in a press release.
The e-book app spec supports color illustrations and copyright protection for storing pre-loaded books on SD cards. "It turns billions of existing SD mobile phones and devices into e-readers,” Frentz said.