SDHC

A new SD format, SDHC (Secure Digital High Capacity, SD 2.0), allows capacities in excess of 2 GB. SDHC uses the FAT32 file system which supports a higher data density than FAT16[10]. It uses the same form factor as SD, but the SD 2.0 standard in SDHC uses a different memory addressing method (sector addressing vs byte addressing), thus theoretically reaching a maximum capacity of up to 2048GB. SDHC cards only work in SDHC compatible devices, but standard SD cards work in both SD and SDHC devices. The SDHC trademark is licensed to ensure compatibility.[11]

In August 2007 Toshiba announced that they would be launching a 32GB SDHC card and an 8 GB microSDHC card worldwide in January 2008. Toshiba also announced a 16GB version available in the last quarter of 2007.

A number of Key Features have been published for each:

1.SDHC Memory Card (High Speed Type) (1) Realizes maximum write speed of 6 MB per sec. (2) "Class 4” SD Speed Class, guaranteeing sustained data write at 4 MB/s. (3) Integrates highly secure CPRM copyright technology.

2. microSDHC Memory Card (1) Realizes large 8 GB capacity in a microSDHC Card. It can store 139 hours of music at a bit rate of 128kbit/s. (2) "Class 4” SD Speed Class, guaranteeing sustained data write at 4 MB/s. (3) Integrates highly secure CPRM copyright technology.

SDHC cards have SD Speed Class Ratings defined by the SD Association. The SD Speed Class Ratings specify the following minimum sustained write speed on to empty SDHC cards:

Class 2: 2 MB/s
Class 4: 4 MB/s
Class 6: 6 MB/s

As of April 2007, examples of devices which support the SDHC format include:

Photo / video
- Recent models of Canon PowerShot (aka Digital IXUS and IXY Digital),
Canon EOS, Casio Exilim, and Panasonic Lumix digital cameras
- The Nikon D40, D40x and Nikon D80, Pentax K100D, Pentax K110D (with
ROM Firmware ver. 1.01 and later) and the Pentax K10D digital SLRs as
well as ROM updates for other Pentax models
- Panasonic HDC-SD1 and SD5 camcorders
- The Kodak Z1275 will support the SDHC cards up to 8 GB.
- The Sanyo Xacti HDTV video camera
- The Ricoh Caplio R5 (with Firmware v1.6 or later) and Caplio R6.
Audio
- Cowon D2
- Creative Labs ZEN
- Edirol R-09 Solid State Digital Audio Recorder (Firmware 1.10)
- Sansa e200 series with Rockbox firmware (all non -R models) [12]
- Zoom H2
Readers
- SanDisk MicroMate compact USB SD adapter
- Kingston MobileLite 9 Multi Reader
- SanDisk Sansa View
- YE Data YD-8V08 internal floppy disk drive + 18-in-one internal USB
memory card reader/writer
- One Laptop Per Child XO laptops
Other devices
- The HTC Touch and TyTN II smartphones
- The Palm Treo 680
- The Nokia N800 Tablet
- The HTC P3600
- Several Garmin GPS devices such as the Zumo and Nuvi with the proper
software version.
- Nokia N95 mobile phone