usb error, remove device. after this message

Burning the flash card

What, exactly, is the issue you're having?

I connect a new flash card and the card breaks

I'm sorry, but that doesn't give me much information... all I know is that you're using a CDJ-900nxs and have a "flash card that breaks."

What breaks? What is the type of the drive / card? What is the format?

Details, please.

I think High Voltage is coming from the USB port

And what information do you have to support this theory?

nothing

So it's entirely possible the problem is the drive you're using?

Try a different drive.