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Stranges values in FAT_VI.Status

Hello

I have a strange case, I use usb to mount the SD card, after below code, I got mc0.Status == 0x001B, other fields in mc0 seems invalid, what's does this Status mean? possible meanings?

mc0 = ioc_getcb (NULL);
if (ioc_init (mc0) == 0) { ioc_read_info (&info, mc0);
}

In keil's example project, I saw mc0.Status should be 0x003B.

Thanks
/Wang

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