1. Please make sure that your source data size is not bigger than the target and that the data location of the source has not exceeded the target Flash.

2. If you are copying NTFS format, please make sure the capacity of the target Flash is at lease 1MB larger than the source Flash.

3. Please check the source media in PC to see if it can be accessed with no error.

4. If you are copying from an SD card, please check to make sure that the SD card is not locked.