SanDisk Ultra 64GB UHI-I/Class 10 Micro SDXC Memory Card Up to 48MB/s With Adapter- SDSDQUAN-064G-G4A [Newest Version]

CUSTOMER REVIEW



Vine Customer Review of Free Product (What's this?) The primary reason for accepting this extra capacity SanDisk 64GB Ultra Class 10 Micro SDXC 48MB/s speed [Newest Version] for review was to compare with the SanDisk Ultra 64GB MicroSDXC Class 10 UHS 30MB/s [Old Version] which I already own and several other similar capacity SDXC cards that I have from different manufacturers. This card reviewed here comes with awesome '10 year' warranty with decent read and write speeds just like the old version. IMHO slightly better read speeds than the old version. Read speeds are very good but the writes are generally slow in these category of cards (Remember what you are paying for) I wanted to share my tests & benchmark photos but Amazon is yet to approve the photos for display. I doubt it will ever get approved for display on this product page.



EDIT: 09/09/2014 (Since I got comments and requests to test on Android devices)

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Here are my benchmark numbers:

(Tested on PC) - 45.98MB/s read 35.92MB/s write (File Benchmark on Mounted exFAT File-system)

(Tested on Android Phone)(Kit-Kat) - 33.01MB/s read & 12.44MB/s Write Benchmark using A1 SD Bench running on Android Kit Kat 4.4.2 based Motorola phone.



Having said, I have purchased many SanDisk products before in the past. I have yet to have one fail or develop any defects even after prolonged everyday use. The first purchase done several years ago was a mere SanDisk microSDHC 32GB Flash Memory Card and while it was cutting edge when I purchased it and it still works perfectly. BTW that product is still sold on Amazon that shows people still love it even though it is slow. In my experience SanDisk products are always excellent buy. Having said, If possible always buy from trusted source like shipped and sold by 'Amazon LLC' (Not 'Amazon Marketplace' or third party sellers on 'Ebay') Since some of those products may be counterfeit products and your results will vary.



Just like the previous model SanDisk Ultra 64GB MicroSDXC Class 10 UHS 30MB/s [Old Version] this one too came with this '16MB' partition offset as seen with the old model. SANDISK now seen to factory format the card with 'exFAT' but also somehow seen to include an 'offset' of 16MB as before at the beginning of the card which shows up as '16MB unallocated' region in the initial sectors on this card under windows disk management tool. This 'offset' of 16MB at the beginning of the card does not cause any problems in PC environment but in certain Android tablets and phones may cause the 'MTP' application to misbehave or some phones may reboot when you attempt to reformat the card. But I am happy to share that you can get this to work flawlessly after clean wipe of the partitions and let the Android device reformat the card.



The solution is to get rid of that 'unallocated' 16MB partition on the card. You could do it in PC but that might require some windows command line experience and using 'diskpart' utility and what not and I do not want to confuse people here with that process. For most novice users The process should be very simple, Just insert the card on the tablet and use the 'native' SD Card format tool or erase SD card under 'settings' that Android OS has and it will get rid of that 16MB partition and happily format and remount it. Now after this simple process the 'MTP' application works just fine with PC to transfer files to the SD card without any strangeness or odd reboot phenomenon when you attempt to format the card.



Not sure why SANDISK formats their newer Class 10 card in this fashion (They never did it with their class 6 cards earlier) and there's gotta be some technical explanation for why they include that 16MB partition that only SANDISK can give. In the end if you reformat the card in the tablet (Which defaults to exFAT) the card is seen to work just fine.



Read/Write Speeds while not as fast as Samsung Electronics 64GB PRO Micro SDXC with Adapter Upto 90MB/s Class 10 Memory Card (MB-MG64DA/AM) or SanDisk Extreme Plus 64GB MicroSDXC UHS-I Memory Card Speed Up To 80MB/s With Adapter, Frustration-Free Packaging- SDSDQX-064G-AFFP-A but remember you do have to pay premium price to get that speeds. For the price you pay for this card IMHO is slightly better than the old version.



Bottomline:

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This is an awesome 64GB capacity MicroSD card from a reputed manufacturer for budget minded people and gets the job done beautifully. This new version is slightly faster than the old version but The read and write speeds are adequate enough for most Audio,Video & picture file formats in a tablet or phones. The 'offset' of 16MB glitch mentioned above forced me to give *Four* stars instead of *Five* stars but let that not stop you from making a decision to buy it since you can easily get rid of that partition.



Highly recommended!



Cheers!