Sandisk 4 Gb Mobile Microsdhc Flash Memory Card Sdsdq-004g-affp

Sandisk 4 Gb Mobile Microsdhc Flash Memory Card Sdsdq-004g-affp Price

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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.
Read the full review. Sandisk 4 Gb Mobile Microsdhc Flash Memory Card Sdsdq-004g-affp

Sandisk 4 Gb Mobile Microsdhc Flash Memory Card Sdsdq-004g-affp Price

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Sandisk 4 Gb Mobile Microsdhc Flash Memory Card Sdsdq-004g-affp Overview

Capture more photos, record more Full HD videos and play more music on your mobile phone with reliable SanDisk microSDHC memory cards. By adding more memory to your mobile phone, you can transport and store more photos, Full HD videos and music - so you can get the most out of your mobile phone. Do more with SanDisk mobile memory cards.

Sandisk 4 Gb Mobile Microsdhc Flash Memory Card Sdsdq-004g-affp Feature

Size: 4 GB | Product Packaging: Amazon Frustration-Free

• Ships in Certified Frustration-Free Packaging

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Sandisk 4 Gb Mobile Microsdhc Flash Memory Card Sdsdq-004g-affp Detail

Size: 4 GB | Product Packaging: Amazon Frustration-Free

• Product Dimensions: 0.3 x 0.6 x 0.4 inches
• Shipping Weight: 0.2 ounces (View shipping rates and policies)
• Shipping: Currently, item can be shipped only within the U.S.
• ASIN: B007KFXIE8
• Item model number: SDSDQ-004G-AFFP

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