This is a dodgy area.
I got a prefectly good micro sd. Cheaply made, worked fine in other devices though.
It corrupted immediately or within hours of putting movies on it in the Xperia Z1.
It bought a high-end Sony 40 MB/s U1 micro SD - 16GB. I added songs, movies. Up plugged and plugged in without "ejecting" from the pc. I really kicked its a$$.
No problem.
Basically the top end cards are near bullet proof.
And unfortunately it seems the xperia z seris like the smell of napalm in the morning.
I saw on another forum (xda developers I think) that the voltaage for SD cards is max 3.75, but they found the xperia was putting out 4.0. Now DON"T quote me, as I am as confused as any noob should be. But a phone they might be throwing some voltage spikes, runs at 40 degrees, and has a sd card about a centimetre away from the innards that produce that, needs an SD card that can take a right hook form Mike Tyson, or catch a .50 calibre bullet in it's silicon etched teeth.
Go high-end, and get a receipt. If it doesnt work, get a refund. I think K-Mart would be a good starting place.
