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stm32f7 USB MSC class problem in HS mode (Solved, IAR optimization bug with USB lib)

Question asked by li.zixun on Feb 14, 2016
Latest reply on Dec 10, 2016 by Geoff Espin

I tested the official USBD MSC exemple with a stm32f746-disco board in HS mode, and I got a very bad speed. For several high speed sd card, I got write:400KB/s, read: 1.6MB/s.

Then I tried to increase the MSC_MEDIA_PACKET, then the board showed as unknown device, which works in FS mode (for a  buffer of 16384 I got write:700KB/s).

Is this a bug MSC_MEDIA_PACKET with HS mode ?