Secure digital high capacity (SDHC) cards usually are used as additional storage in various electronic devices. They have the ability to store more information than their standard secure digital cousins. An SDHC card reader allows the card to be used in compatible devices with a Universal Serial Bus (USB) port, such as a computer.
SanDisk Corporation, in cooperation with Panasonic and the Toshiba Corporation, developed the first secure digital (SD) memory card in August of 1999. Since that time, there have been numerous developments on the original design. SD memory cards continue to get smaller and have larger storage capacities.
SDHC cards use the Secure Digital Association (SDA) newer specification version 2.0. Many newer electronics, such as cameras, MP3 players, and mobile devices, can utilize the benefits of this quicker and more advanced protocol. Digital devices that are SDHC compatible can use these larger-sized memory cards.
Standard SD cards typically are no larger than 2GB. Using the latest technology, the SDHC cards begin at 4GB and, as of 2009, reach a maximum of 32GB. A benefit of the greater size means that more of the higher resolution music, photos, or videos can be stored on them.
The SDHC card reader makes transferring files from digital devices to computers and back again easier. Many computers have a USB port for input devices. Card Readers have a USB connection and a slot to slip in the memory card. Frequently, these card readers will accept additional memory card formats, such as Memory Stick, MultiMedia Card (MMC), or xD.
Like the device the memory card is being used in, the SDHC card reader must be compatible for these high capacity cards. Some of the older model card readers are only able to read standard SD memory cards. Readers that will allow the use of an SDHC card generally are marked as such.
Electrical connections at one end of the SDHC card reader allow communication of the data to the USB port. This type of connection allows the reader to function much like a USB flash drive. Files can be transferred to and from various SD and USB port devices.
Often, mobile devices use these smaller types of SD cards for data storage. The higher demands in mobile technology help drive the need for higher capacity memory cards for these devices as well. An SDHC card reader will accept miniSD and microSD cards with the use of an SD card adapter.