What is Secure Digital High-Capacity (SDHC)?
* Please note: Some of the listed capacity is used for formatting and other functions and thus is not available for data storage.
For more information, please consult Kingston’s Flash Memory Guide at kingston.com/Flash_Memory_Guide.
** Same as the current SD Memory Card size standard.
*** Same as the current microSD Memory Card size standard.
SDHC, the SDHC logo and SD are trademarks of the SD Association.
Product specifications subject to change without notice.
SDHC (Secure Digital High-Capacity) is a new Flash memory
card based on the SDA (Secure Digital Association) 2.00
specification. SDHC provides removable memory storage for
compatible digital devices, including cameras, camcorders,
mobile phones, PDAs, MP3 players and more.
The increasing use of high-definition video, high-resolution
digital photography and mobile applications demands higher
storage capacity and more demanding data transfer rates.
Because of this, the new SDHC cards guarantee a minimum
sustained data transfer speed, not a maximum speed. There are
four available speeds — Class 2, Class 4, Class 6 and Class 10.
SDHC vs. SD Card Compatibility
The previous versions of SDA specifications did not provide
such common standards for sustained data transfer speeds to
be shared by all manufacturers. The new speed classification
approach allows users to select card performance based on
the needs of particular applications, such as HD video, and
other MPEG applications, rather than just a maximum speed
SDHC cards use the same physical format as SD cards but
cannot be used with SD host devices that do not comply with
SDA Specifications Version 2.00.
Host devices complying with SDA Version 2.00 can use both
SD Memory Cards and the new SDHC Memory Cards.
Current SD cards complying with Version 1.01 and Version
1.10 use either the FAT12 or FAT16 file system, whereas Version
2.00 uses FAT32. This latest specification was established to
support SDHC card applications with higher capacity needs.
If the approved microSDHC or SDHC logo appears on the
card or package, the product is compliant with SDA 2.00
Compatibility Quick Reference
SD up to 2GB SDHC ≥ 4GB
(SDA V 1.01 or 1.10) Y N
(SDA V 2.00) Y Y
The new specifications continue to offer highly reliable
copyright protection function, which is one of the SD Memory
Card’s most distinguishing features, making it an ideal solution
for digital content distribution.
SDHC Specification Ver. 2.00
•• Capacities* 4GB–32GB
•• SDHC 0.94" X 1.26" X 0.08"
Dimensions** (24mm X 32mm X 2.1mm)
•• microSDHC 0.43" X 0.59" X 0.039"
Dimensions*** (11mm X 15mm X 1mm)
•• No. of pins 9 pins
•• Voltage 2.7 to 3.6V
•• File System FAT32
Data Transfer Rate (DTR)
Speed class logo indicates device performance.
guaranteed minimum DTR 2MB/sec.
guaranteed minimum DTR 4MB/sec.
guaranteed minimum DTR 6MB/sec.
guaranteed minimum DTR 10MB/sec.
Examples of performance class use
Higher resolution needs higher capacity
Source: SDA 2006
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