Polaroid 32 GB CL10 micro SDHC Flash Memory Cards for Tablet PCs and Smartphones (P-SDU32G10-EFPOL) Sale
Best Review: Polaroid 32 GB CL10 micro SDHC Flash Memory Cards for Tablet PCs and Smartphones (P-SDU32G10-EFPOL) - I have tested dozens of SDHC and micro-SDHC cards. One disturbing trend I noticed is that: the speed class rating for micro-SDHC is typically inflated. For example, a 'class-10' rating means the card must deliver a sequential write speed of at least 10MB/s. But somehow, a class-10 microSDHC cards is always slower than a class-10 SDHC card from the same manufacturer. Case in point: the PNY 32 GB microSDHC Card (P-SDU32G10-EFS2) claims to be 'class-10', yet it can only write at 8.6MB/s maximum, while the full-size PNY P-SDHC16G10 achieved 13.4MB/s according to CrystalDiskMark v3.01.This Polaroid 32 GB micro SDHC (P-SDU32G10-EFPOL) did better than the PNY microSDHC. It achieved a sequential write speed of 10.3MB/s in CrystalDiskMark. So strictly speaking, it does qualify as a 'class-10' card. However, a closer look at its random write speed revealed its weakness. For writing small files, this Polaroid class 10 card is actually much slower than the SanDisk class-4 microSDHC SDSDQM-032G. See the benchmark results I uploaded to 'Customer Images' for details.When you use a memory card in a digital camera to record HD video, it needs to store a huge video file each session. That means its sequential write speed is most critical. So you should always choose a class-10 card over a class-4 (assuming both speed ratings are honest, of course).When used in a tablet or a smart phone, however, the card's random write speed for small files is more important. That's why in such applications, the SanDisk class-4 card will actually perform faster than this Polaroid class-10 microSDHC card. The Sandisk card is also priced lower as of this writing.[Other Notes]- Polaroid Corporation went out of business 4 years ago, so I have no idea who actually makes this 'Polaroid' card. The back of the card says "Made in Korea".- The size of this '32GB' card is 29.9GB according to my computer. This is actually normal because computer people count one Gig as "2 to the power 30", which is 7.3% larger than one billion. So 29.9GB translates to 32 billion bytes, which is '32GB' according to marketing people.[Update on Jan 7, 2013]I have tested the SanDisk Ultra 32 GB microSDHC Class 10 card (SDSDQUA-032G-U46A), and found it to give faster all-round performance. It is better suited for use in cameras and tablets alike.
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