updated 05:30 pm EST, Fri November 12, 2010
ATT warns WP7 needs cerfiied storage cards
AT&T in a statement today said the Samsung Focus and other Windows Phone 7 devices would need special microSDHC cards. Removable storage isn't yet officially supported by the mobile OS, but the carrier said users could do a one-time storage upgrade once "Certified for Windows Phone 7" cards were in stores. Faster cards with "optimal performance" are necessary, but current cards don't have that qualifier, according to AT&T.
WP7 can technically expand beyond whatever storage is built-in but doesn't have a way to address a card other than by joining it with the main storage. It also requires wiping the phone and can often be very sensitive to the particularly card, either running unacceptably slowly or damaging data on the card. The card also usually becomes unusable elsewhere.
Focus owners who try to reach the slot are greeted with a "stop!" warning from AT&T that discourages them from inserting a card.