The 16GB Kingston microSDHC for the Samsung Focus is the best option if you want to add more storage to your Samsung Focus Windows Phone. If you'd rather go with another card, here are some helpful hints:
Choose a Fast microSD Card
Because storage on the memory card is being commingled with internal memory storage, you don't want to use a slow microSD card in the Focus. Doing so can cause performance issues or a failure to recognize the card altogether.
Problem is, most users don't realize there's a difference between microSD cards; if it fits, it fits. What you want is a microSDHC card with a fast data transfer rate.
When choosing a memory card, opt for a Class 4 microSDHC card. Class 2 is supported, but you'll get better performance reliability from the faster Class 4s. The even faster Class 6 cards are likely supported, too.
Other Performance Considerations
Microsoft also reports that there are other microSD considerations vis-à-vis Windows Phone 7:
"Determining whether an SD card is Windows Phone 7 compliant is not a simple matter of judging its speed class. Several other factors, such as the number of random read/write operations per second, play a role in determining how well an SD card performs with Windows Phone 7 devices."
Cards marked as "Windows Phone 7 Compliant" are now available, including 16GB and 8GB Patriot memory cards.
Choose a Name Brand Card
Like all memory types, there are great, good, and bad microSD cards. In many smartphones, slow or spotty card performance may go unnoticed by the user, but this isn't the case with the Focus. Opt for a name brand card like SanDisk or Kingston.
What's the Maximum microSD Card Size Supported?
Windows Phone 7 supports microSDHC cards up to 32GB. This is currently the largest capacity microSDHC card available.
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