Bulk stream: reading old data

Dear Sir/Madam,

I am using LibUsbK to read chunks of Bulk stream data (not all data is supposed to be read), sent from a USB 3.0 device. The USB device obtains and passes live data to the PC at 10 MHz, without caching/buffering.
Program works as follows:

1)      Initialize USB

2)      Clear pipe

3)      Get overlap

4)      Read variable amount of data (in KB)

5)      Wait and release

6)      Process

7)      Optional restart for new data, from step 2) onwards

During testing with this program I encountered an issue whereby old data is obtained for the first ~64 KB of every read. Only after reading more than 64 KB the actual live data is obtained. I made a workaround by obtaining 64 KB + requested amount data and removing the first 64 KB, but I am looking for a better solution. Physically disconnecting and reconnecting the device clears this buffer (while the device remains powered and the program is still active).

Could anyone shed some light on this issue? Is there perhaps some kind of buffering going on in the driver? Can this buffer be cleared before the read?

Best regards,

Marcel

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