SDHC Cards

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SD cards have a variety of uses and are nearly ubiquitous in devices such as smaller digital cameras and digital audio recorders. With ever-growing image and file sizes SDHC (Secure Digital High Capacity) cards are becoming more and more common. So, while finding any memory card for a device is a rather simple task, finding one that meets the needs and specifications of the intended device may require more information.

Is it Compatible?
The very first thing to consider when making a purchase is whether or not the intended card is compatible with its destined device. SDHC cards are not compatible with older devices that only use standard SD cards. Be sure to consult documentation from the device manufacturer to ensure that the card being purchased will function properly with the intended device. Additionally, even higher capacity SDXC cards are now available that may not be compatible with many devices.

How Much Space Do I Need?
The next thing to consider is how much capacity is needed. SDHC memory cards are available in 4GB, 8GB, 16GB, and 32GB capacities. Photo and video cameras especially will often need more memory space than other devices. While many factors determine the exact amount of space used, 20GB for 1 hour of 1080p video or 1200 images is a good rough metric to use for deciding how large and how many cards are needed. Again, the documentation from the device manufacturer will have more precise file size estimations for a specific device.

Data Rates for High Performance
Data transfer rate is the next important factor to consider. Certain types of devices require faster data transfer rates in order to capture files properly. Primarily, this is a concern for devices that capture high-definition video at resolutions of 720p or higher and for cameras that capture images in quick, large bursts. SDHC cards indicate data transfer rates with various "class" markings. For example, the letter "C" with a 4 inside indicates a card is class 4, which means it has a minimum data transfer rate of 4MB/s. Class 2, 4, 6, and 10 are available and are indicated with the same letter "C" with the corresponding class number inside. The higher the number class, the faster the data transfer rate. Cameras that capture 1080p video will often recommend a class 10 card.

Additionally, Ultra High Speed (UHS) cards are available for specific devices that make use of this added technology built into certain SDHC cards. This will be indicated on the memory cards with a Roman Numeral I or II and with the letter "U" and the number 1 or 3 inside. This indicates the UHS version and speed class. Cameras that capture 4K resolution video will often require a UHS card. Many devices do not take advantage of the additional UHS speeds. Consult the device documentation for specific recommendations.

Some mobile phones and other devices use a smaller form factor card called micro SDHC. They are functionally the same, only smaller. If purchasing one of these, ensure that an SD card adapter is included or is purchased as well if the micro SDHC is intended to be connected to a card reader.
Add to cart SanDisk Ultra SDSDUNC-016G-AN6IN 16GB Flash Memory, SDHC
Open PNY Performance 16GB SD (SDHC) Class 4 Flash Memory Card
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Add to cart PNY Performance 16GB SD (SDHC) Class 4 Flash Memory Card
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