Laptop processor fan wiring

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Toshiba Satellite laptop, cpu fan connector brokenof motherboard. I want to wiree fan to usb connection. don't care about fan speed reporting. I presume wires on fan are; red wire power 6v, 300 ma printed on fan, black wire ground, orange wire speed monitor. Does anyone know for sure? Does this sound like a good plan? I think the fan will power up only when computer is on and think it will run all the time(some only run when temp reaches a determined limitas a power saving measure)This sounds like a better plan than trashing the laptop or having it shut down from overheating, I am planning on also using a cool mat at all times the laptop is in use.
The fans on this are powered by a second usg port.