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Caution when using USB storage device
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If USB storage device has a built-in auto recognition program or uses its own
driver, it may not work.
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Some USB storage devices may not work or work improperly.
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Use only USB storage devices formatted with FAT32 or NTFS File System
provided by Windows.
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For external USB HDD, it is recommended to use device of less than 5V rated
voltage and 500 mA rated current.
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It is recommended to use a USB hub or hard disk drive with power supplied.
(If the power supplied is not enough, the USB storage device may not be
detected properly.)