Why use sdhc

As an example for demostration purposes, Class 2 is sufficient for SD video recording, whilst Class 4 and Class 6 support HD recording. The Class rating is displayed on the card, by a number nested inside a circle. After the Class 10 classification, it becomes a little more complicated. An additional standard called UHS was introduced, which allows cards to reach higher speeds. UHS speed classes are shown on the card with a number inside a U.

Some cheaper action cameras will buffer the recording, but this is not practical in the slower card speed classes, and may cause juddering or stuttering of the recorded footage, as well as other issues. Similarly with the latest Digital SLR Cameras especially in modes such as sport, multi-frame or burst-mode where multiple images are taken, having a faster card will allow you to review the images much sooner less waiting for the images to write to the card.

As a disclaimer, most devices such as cameras, mobile phones and card readers will generally work with older SD Cards , but newer SD Cards with higher Class and Speed classifications may not work in these older devices — check your owners manual or Search online for compatibility for cards that work with your device before purchasing.

Also Full-size SD cards and Micro SD cards may not work in devices that are specifically designed for one or the other, even though smaller cards can fit into larger card slots via adapters see the section below. SD bus speed of UHS-I can provide ultimate bus speed using 1st Row pins. Think of the bus interface as the number of lanes on a freeway vs. If you have older equipment that you plan on upgrading soon, getting a faster card than you currently need may make sense.

Once you figure out the specs for your desired card, you can easily comparison shop around the internet. Ask any tech question at: Facebook. Meltdown, Spectre flaws: What you need to update. What to expect from this year's CES.

HDTune is the gold standard for drive benchmarking because it measures the consitency of the transfer rate basically the read rate and provides tha access time the delay between when the computer tries to read data and when the data is available. We also benchmarked a traditional 2. The most interesting item of note in these benchmarks is that the SDHC cards managed to deliver access times similar to that of a genuine SSD.

This means the instant your computer needs to find data it is there. One of the first clear limitations we encountered during our testing on multiple notebooks is that some laptops use slow built-in card readers.

Keep in mind the card being used in this test is a class 6 SDHC card … one of the fastest cards available:.

As you can see from the image above, the speed of the built-in card reader can be a serious bottleneck in the performance of the card.