The Samsung Focus ‘s microSD slot has always been an odd little blip on the spec sheet, since it’s only kinda-sorta supported by Windows Phone 7 , and now it looks like it’s causing more trouble than it’s worth: Paul Thurrot says AT&T’s telling employees not to install anything in the slot because of reliability issues, and that Microsoft is working on the problem. Now, we’ve had mixed experiences using the microSD slot ourselves, and we’ve been told by numerous sources that AT&T and Samsung added the feature without too much encouragement from Microsoft, which told us at MIX that expansion wouldn’t be supported by WP7 at all. We’ve also been told by reliable sources that the problem is primarily to do with microSD speed and reliability — apparently only the fastest cards will work well, and current microSD class ratings aren’t accurate or meaningful enough to be useful. We’d bet Microsoft and Samsung get together and put out a line of Focus-specific cards before this is all over — but wouldn’t it have been easier to just build in 32GB of storage from the start? Samsung Focus having microSD issues, AT&T not installing cards in-store originally appeared on Engadget on Tue, 09 Nov 2010 11:52:00 EDT. Please see our terms for use of feeds . Permalink