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The SD Cards That Do/Don’t Work With Windows Phone

Over at XDA, emjee87 has been compiling a list on what microSD cards are reported to work with the Focus/WP7. This is because AT&T has gone back and forth on if SD cards should be installed and if so which ones, etc. Remember that this list is a work in progress so we need to see what happens as the cards get filled and used more often. You can also see that people are reporting issues, with some cards not working at all, some slowing down over time and some causing reboots so this is a real issue. So bear in mind that Windows Phone is only a few days old in the US this has to be treated as a rough guide but it’s better than what AT&T has told us (which is nothing):

Confirmed Working(Data remains after soft reset):
Kingston 4GB Class 4
Kingston 8GB Class 4
Kingston 32GB Class 4
Microcenter 16GB Class 2
SanDisk 8 GB Class 2
SanDisk 16GB Class 2
SanDisk 16 GB Class 6
Currently Unstable/Unsure:
SanDisk 32 GB Class 2
Confirmed Not Working(Data gone after soft reset):
A-Data 4GB Class 6
A-Data 16GB Class 6
Lexar 16GB Class 6
Transcend 8GB Class 6
Transcend 16GB Class 6

For my two cents, I’m using a Kingston 32G Class 4 without problems but I haven’t loaded it up with more than a gig or two of music so far. Let’s keep their work going and add your results to the XDA thread and we’ll follow it here as well.

By the way, here’s MS’s warning on the issue but the don’t provide a list of working cards aside from the preinstalled ones.