SanDisk 32 GB microSDHC Flash Memory Card (card only) SDSDQM-032G
- Available capacities: 2 GB*, 4 GB, 8 GB, 16 GB, and 32 GB
- Seamless speed and performance with microSD/SDHC compatible devices
- Class 4 Speed performance rating (based on SD 2.0 Specification)
- Tested under the most extreme conditions
- 5-Year limited warranty
Sandisk SDSDQM-032G-B35N 32 GB microSD High Capacity (microSDHC) SDSDQM032GB35N Flash Memory
List Price: $ 90.99
Price: $ 25.66
3 Comments
This Sandisk ‘class-4′ micro-SDHC card is faster than a PNY ‘class-10′,
I purchased a SanDisk 32 GB microSDHC Flash Memory Card SDSDQM-032G nearly two months ago, for use in my VIZIO 8-Inch Tablet VTAB1008. At the same time, I also purchased a higher-priced PNY 32 GB microSDHC Card (P-SDU32G10-EFS2) which is supposed to be a ‘class-10′. My benchmark results, however, show that the Sandisk class-4 card is actually faster – most of the time.
I used two sets of benchmark programs. One is called ‘Flash Memory Toolkit v2.0′, which measures the random read/write speed of files between 1MB and 15MB. The other one is called ‘H2testw v1.4′, which measures the sequential read/write speed using 1GB files. Here are my results: (see my uploaded charts in ‘Customer Images’ section for details)
- For smaller files (1-5MB), the Sandisk class-4 card gives an amazing write speed of 15-17MB/s, while the PNY ‘class-10′ card can only get 1-6MB/s
- For larger files (10-15MB), the Sandisk and PNY cards are about equal at around 8MB/s for write
- For huge files (1GB), the PNY did better at 9.5MB/S, while the Sandisk dropped to 5.5MB/s
- The read speeds of both cards are equally high at around 18MB/S (this number may be limited by the maximum speed of my card reader used)
What the above shows is that: When used in a typical digital camera (with file size 3-5MB), this Sandisk ‘class-4′ card is at least twice as fast as the PNY so-called ‘class-10′ card. But when used in a HD video camera (sequential writing of huge file), then the PNY card should perform better.
For a card to be marketed as a ‘class-10′, it must maintain a MINIMUM write speed of 10MB/s. So by this definition, the PNY card does not qualify since it cannot even achieve a MAXIMUM write speed of 10MB/s. This Sandisk card, on the other hand, exceeds the requirement of ‘class-4′ by a huge margin.
Sandisk seems to be the only flash memeory manufacturer that still gives honest, conservative speed class ratings. Any other manufacturers would have labeled this card a ‘class-6′ or even higher. As a matter of principle, I rather give my money to a company that promises less but delivers more, instead of to others that do the opposite. At the present cost of about 1 buck per GB, this is an unbeatable deal!
[Aside]
The capacity of this card, as reported by my computer, is only 29.7GB. Note that this is actually normal, because compter people define one ‘Giga’ as ’2 to the power 30′, which is 7.4% greater than 1 billion. So 29.7GB comes to just about 32 billion bytes, which is ’32GB’ according to marketing people.
[Update Dec 3, 2011]
I re-tested the two cards above, using the CrystalDiskMark v3.01. The results are consistent with my previous finding. See my newly uploaded charts in ‘Customer Images’ for details.
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|Failed on First Use,
SanDisk 16 GB microSDHC Flash Memory Card (card only) SDSDQM-016G The 16gb version of this card failed upon first use. Out of the package it promoted me to format it on my computer (which very few, if any cards ask you to do out of the package). Attempts to do this were not successful on 5 different computers. After researching this online it turns out this is the sign of a “bad card.” A similar Listing on Amazon lists all the other customer experiences regarding the failure rate of this Micro SDHC card. SanDisk 16 GB microSDHC Flash Memory Card SDSDQ-016G With having a bad experience out of the box and knowing there are “known issues” with this card, I can’t even really give it one star.
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|Motorola Xoom Tablet,
I had concerns about ordering this Class 4 card as I intended to use it only for video files of movies and TV programs recorded off the air and converted to a suitable format for the Motorola Xoom tablet. I am happy to report that it works like a champ and videos play back just fine.
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