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06-11-2012, 01:53 PM   #1
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Sandisk 32GB ultra SD card

It's about this card.
SanDisk 32GB SDHC Memory Card Ultra Class 10 UHS-I

It's classed on the card as class 10 but the title and the text says it's UHS-I, so what is it?

I've discovered the difference is in the data transfer-rate, 50mhz (class 10) and 100 mhz (UHS-I) is what makes the differences.
Difference between Speed Class, UHS Speed Class, and Speed Ratings (performance) for SD/SDHC/SDXC cards

06-13-2012, 07:31 AM   #2
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Hello,

According to Sandisk, UHS-1 is an enhancement to their memory cards.

"Ultra High Speed, Phase I (UHS-I) bus design for SDHC and SDXC cards was added in SD spec 3.0. This is a design enhancement to increase the performance of SDHC/SDXC cards.

UHS-I specification defines two bus architecture options for up to 50MB/s (UHS-50) and 104MB/s (UHS-104) data transfer rates. These are theoretical maximum limits and actual maximum performance for a specific card is defined on it label or in advertising.

UHS is an enhancement to the original SD interface specifications. Host devices will obtain the UHS maximum speed when both the card and host device support UHS. Otherwise, the host device and card will use the slower SD maximum speed obtainable."


The speed rating measures maximum transfer speed for reading and writing images to and from a memory card, expressed as megabytes per second. However, video doesn't need as big a data pipe because the video format is a smaller "fixed stream" that uses only a portion of the data pipe.

Unlike card write speeds that measure
maximum performance, class ratings measure the minimum sustained speed required for recording an even rate of video onto the card. The class rating number corresponds to the transfer rate measured in megabytes per second. Class 2 cards are designed for a minimum sustained transfer rate of 2 megabytes per second (MB/s)1, while Class 10 cards are designed for a minimum sustained transfer rate of 10MB/s2.

C h u c k C a p r i o l a
Live Chat and E-Mail Sales Manager B&H Photo-Video

Thank you, we appreciate your business.
*** Peace on Earth ***
06-13-2012, 10:09 AM   #3
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So it's an UHS-I card not a Class 10?
06-13-2012, 11:28 AM   #4
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Hello,

From my understanding, its both.

Chuck

06-13-2012, 12:48 PM   #5
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UHS-I cards are backwards compatible with class 10 it's strange the text say it works with UHS-I but the indication on the card and package shows only class 10 logo not the UHS-I.
Maybe it's better to contact Sandisk directly.

Thank you for your time.
06-14-2012, 04:25 AM   #6
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Reply from Sandisk.

QuoteQuote:
Thank you for emailing SanDisk Technical Support. It is our goal to make sure you have all the resources you need to get the most from your product.

I understand that you have purchased a SanDisk Ultra 30MB/s UHS-I 32GB SDHC card. On the link you provided you can see in the text that the card is UHS-I but on the package of the card you can not see the UHS-I logo. When you look on the package next to "SDHC" you will see "I". This is the current UHS-I logo.

UHS utilizes a new data bus that will not work in non-UHS host devices. If you use a UHS memory card in a non-UHS host, it will default to the standard data bus and use the "Speed Class" rating instead of the "UHS Speed Class" rating. This means that indeed, as you said, a UHS-I card can indeed be used in a device which doesn't support UHS. UHS memory cards have a full higher potential of recording real time broadcasts, capturing large-size HD videos and extremely high quality professional HD.
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