Size restrictions for USB memory sticks?

Hi out there,
are there any known size restrictions for the use of USB memory sticks with Mac OS X?
I bought two 32 GByte (noname) USB memory sticks to "mobilize" my iTunes-library. I formatted it without errors (believing what the DiskUtility-application told me) and copied my files to one stick. But only about 4 GByte of data where able to be opened after copying. The other files where shown in the directories with their correct sizes (I compared them to the originals on my harddisk) but couldn'd be opened.
I tried copying them a second time, using the second 32 GByte stick - but same behaviour as on stick one.
Next I tried to format both sticks with the DiskUtility using the option "writing zeros in seven runs" and then tested data integrity with the TechTool-Pro application (surface test, random read and write). Both showed no errors on the sticks. But copying my library again to the sticks showed no diffrent behaviour as before. The first few copied GByte (I think about 4 GByte) could be opened by iTunes, but the rest "is only there".
Any idea what's going wrong?
Greeting from Germany
Ansgar

Hello Ansgar,
sounds like one of those faked 32GB Sticks.
http://www.digitv-forum.co.uk/viewtopic.php?t=3680

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