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TE_USB_FX2_GetData() seems unable to use too large arrays or, more precisely, this fact seems variable by changing host computer. To be safe, do not try to transfer in a single packet very large data (e.g. 120 millions of byte); transfer the same data with many packets instead (1,200 packets * 100,000 byte) and copy the data in a single large data array if necessary (with Buffer.BlockCopy()). Buffer.BlockCopy seems not to hinder throughput too much (max 2 Mbyte/s)
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