Reviews and Problems with SanDisk Mobile Ultra microSDHC Series
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Failed after 18 months
Thomas W., Newegg
5 September 2014
Summary: I think SanDisk has gone downhill in quality. This is the first SD card I've had fail. I have a drawer full of SanDisk and Kingston USB sticks and SD cards. One other SanDisk thumbdrive died on me out of the blue. From now on, I'm sticking with Kingston hardware.
Pros: Transfer speed was fast. Worked well in my tablet and eventually my phone. It lasted 18 months, so I'll give it that.
Cons: Started to experience errors on my phone with it and the phone started to reboot randomly. I removed the card from phone and put it in the computer to backup the data. Smart move on my part because it worked for another day in the phone then started to randomly throw errors to the notification ba...
Pros: The card was fast, and performed well for the time I did have it.
Cons: Unfortunately, after about three months of daily use, the card suddenly died on me one evening while it was in my phone. No adapters or readers would recognize it, and even data recovery programs wouldn't see it. This is the first card that's ever failed on me, and what a failure it was.
Summary: I don't know how healing works with computers; makes me worry. Still, I now have (adequately close to) what I ordered, so I'm happy with this product. If you have trouble like I did, try shutting down (take battery out for a minute), then start it all up again.
Pros: Well, it HEALED. After 36 hours in the phone, the card responds properly in all environments.
Summary: It's possible the Galaxy S3 is at fault for the latest problem.
Pros: High memory at a good price
Cons: First attempt to get Windows to format the drive yielded only 27 Gigs. Jeez I tried to format it from my Galaxy S3; same bad result. Almost RFA'd right then, but after talking with tech support, I used a computer with a built-in SD card reader. There, it formatted to 59.4 Gigs; fair enough. Now, ...
Summary: I will update if SanDisk (or anyone) can make it right.
Cons: Got this today -- Windows formatted it as 27 GB, not 64 as advertised. So, I let my phone (Galaxy S3) try -- still 27 GB. So the drive doesn't have even half of its advertised capacity. I will do RMA on it right soon.
Summary: New Crystalmark test: Type / Read / Write Sequential: 34.82MB/s / 8.301MB/s 512K: 32.76MB/s / 0.674MB/s 4K: 3.835MB/s / 1.489MB/s 4KQD32: 3.687MB/s / 1.544MB/s The 4K read speed is up to 1.489 from 0.070, and the 4KQD32 up to 3.687 from 0.074.
Pros: A new card came out of the blue today. I benchmarked it, and it looks like the first one was defective after all. You don't hear about companies sending out replacements on their own initiative very much these days, so NewEgg deserves a big public thumbs up on this.
Cons: No cons. Just props for NewEgg for being a stand-up company.
Summary: CrystalDiskMark results when plugged straight into laptop's card reader using supplied adapter: Type / Read / Write Sequential: 32.90MB/s / 7.973MB/s 512K: 30.61MB/s / 0.591MB/s 4K: 3.168MB/s / 0.070 MB/s 4KQD32: 3.322MB/s / 0.074MB/s Note that 4K write speed.
Pros: Capacity, price/GB
Cons: ABSURDLY slow write speeds. I'm still not sure if mine is a dud, but it took over 12 hours to transfer 14GB of book, video, and music files to my tablet. This thing HATES small files. It works well enough once they're on there, but if it's that slow to transfer them in the first place, it's essen...