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Samsung Focus microSD Memory Card Help


Updated November 2011: The Samsung Focus SGH-i917 is currently the only Windows Phone 7 smartphone in the U.S. to include a microSD memory card slot.  That slot allows the use of microSD and microSDHC flash memory cards to increase the available data storage on the Focus, which is nothing unusual in the world of mobile tech.

But unlike other smartphones with expansion slots, the Focus doesn't use a memory card like a PC uses a USB thumb drive - i.e. as secondary, hotswappable storage.  Instead, Windows Phone 7 treats the memory card as an expansion of the internal memory of the phone.  This gives you total available storage in the system software that's a merging of the available space in the internal memory and the available space on the microSD card.

Because Microsoft chose for the Windows Phone 7 OS to handle memory cards in this way, there are some basics you should keep in mind if you decide to use a memory card with your Focus. 


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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