Why SDMMC sample is 10-times slow than general USB?

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Hi. all.
I executed sample USBD_MS_Example1 in DAVE3 environment.
* USBD_MS_Example1 is USB memory solution

When I copy a file to USB memory, the data rate is 600KByte / sec.
But general USB memory, the data rate is 10MByte / sec.

Please tell me why this happens?
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