Xperia Mini Pro memory card problem

[#1]

Hello!

I've just bought a new memory card (Kingston, 8GB microSDHC, Class4) to my XMP, but it has a little problem about it.

When I record HD video, usually the phone can't play back, it says after a short time "This video cannot play" (or sthing same, in Hungarian "Ez a videó nem játszható le")

But everything else, like videos, photos or music, it plays with no error.

I also check the memory card with h2testw (v1.4), but it doesn't found and problem.

Please help!

Note #1: I download AnTuTu Benchmark (v2.5.1) and I test the original 2GB microSD card and the Kingston 8GB microSDHC card in read and write speed. The test shows that the 2GB memory card is faster (4.1 MB/s write, 12.0 MB/s read) than the Kingston (3.0 MB/s write, 9.4 MB/s read

Can it will be the cause of my problem? =/

[Sam]

In this case it would be worthwhile formatting the memory card that you are having the trouble with. (Please do backup the content on the card first as this will delete all data stored there.

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[#3]

I've tried to format a lot time but it doesn't solved my problem (I also tried with build-in Windows 7 formatter and with SDFormatter)

I choose the cluster size of 32k