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Why my USB card reader's reading/writing speed is so slow on OSX 10.2?

Hi, all
I found a strange phenomena on my USB card reader, when I got 0x28/0x2A 10 bytes read/write SCSI command from upper layer , the data length in the CDB always to be 1/2/4 sectors, no matter how big the copying files are. I do not know how the upper layer control yhe data length, but the result is that reading/writing memory card would be very slow. I doubt it's the upper layer sent down data blocks size is too small so that the read/write speed is si slow, what can I do in my driver?

I heard someone else said that in some newsgroup, is it a system driver problem? How to control the data block size from upper SCSI layer? And, it won't happen on OS9.2/Windows platform, so it may not be the hardware bug.

Thanks&regards,
Robin Wang
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