USB flash card doesn't work

Hi,
I' ve just bought a new Transcend 16GB USB flash card. It works properly when I move files from it to my Macbook Air running Lion.
When I try to move files from the Mac to the flash card, the copy doesn't start and the system stays blocked in "calculating remaining time".
I tried to format it with FAT32 and HFS but nothing changes.
On Windows7 (installed as well on the Mac) the USB flash card works perfectly in both ways.
Can u help me?
Thanks
Marco

I tried with another USB flash card and with a smaller file.
The transferring from Mac to the card starts but is extremely slow ( around 0,5MB/sec)

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Aug 18 11:20:29 arch-box systemd[1]: [email protected]: control process exited, code=exited status=1
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