I have a Roland E-96 (baby brother to your G-1000) and the floppy disk drive spins at all times. I believe there is even some mention of this in the manual. At least, I know it is normal for my keyboard. I would have hoped that Roland put a stop to this on their later models such as yours. It is a quiet sound, but something that seems unnecessary. By the way, I eject the floppy after it loads & then no more disk spinning sound.
Tom
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Tyros 4