Is the Card Only 48 MB sec Maximum Read / Write Speed I see the specification list this card as 48 MB sec maximum Read and Write speed but the SanDisk website and this Model of the same card listed on Amazon; SanDisk Ultra 128GB Ultra Micro SDXC UHS-I/Class 10 Card with Adapter (SDSQUNC-128G-GN6MA) [Newest Version; have the specs as up to 90 MB sec Read / Write. What is the difference in the cards? Is this BestBuy Card UHS-3 and slower?

Question

Keith · Accepted Answer

Everything really depends on what you want to use them for. All claims of speed by mfr's and retailers are questionable as marketing hype. My wife and I recently purchased these cards for our phones. We didn't really check the Read speed, but my initial Write testing using a USB3.0 card reader on my desktop system capped the write speed at about 30MBs. However, that 30MBs is ONLY with a single large (4GB) file being copied and written sequentially. Writing a large group (2000) of small files (average 5MB each) to these cards brings the write speed to a crawl. (Note: It took just over 5 hours to write 90GB of data (music & photos) to the cards.

Note: These cards come preformatted as exFat. Unfortunately, due to our phone limitations, we had to reformat them to fat32 (which slows them further). However, after reformatting, these cards work with our phones and record video and photos with no problems (so far).

In my experience over the last thirty years with computers and photography I have tried numerous mfr's cards. My favorite/recent/current fastest (but yet not ridiculously expensive) is the SanDisk, UHS-3, Extreme-Pro. Even when copying large groups of small files it maintains higher speeds. You will definitely pay more for them. So the question is - do you want speed (buy the Extreme-Pro), or do you want high capacity, at a low price (buy these)?

If you are a professional photographer shooting high speed (10fps) 20Mpx photos these are not the cards for you. But, if you are a pro you wouldn't be asking this question. So I am assuming you are the average user who wants a high capacity card, for a phone, or maybe point and shoot camera, I say go for it you won't be disappointed.

needxrcise · Answer

The "Plus" version is 90, the other is less.

SCAR · Answer

Read and write are not the same speed. I would say that it write about that speed but will read faster than that for sure.

cubs223425 · Answer

The image here shows the 48 MB/s Ultra card. I ordered this, and like the product's name here says, I actually got the 90 MB/s Ultra Plus. Don't worry about performance with this.

SKUSA · Answer

This card is 48 MB sec maximum Read and Write speed. This product is SanDisk Ultra 128GB Ultra Micro SDXC UHS-I/Class 10 Card with Adapter. The only difference is the speed and cost.

Kentoy2012 · Answer

Thank you for your question but honestly I really don't know about what is the difference about what you asked. All I know is that it downloaded my pictures and videos fast and with no problem. Working good with my Samsung note 4 and tablet 4.

Answered by Kentoy2012 10 years ago

hoboruni007 · Answer

90MB sec Read/Write is only on 200GB Ultra Micro SDXC.

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