HDD not found

hello i have asus wl500gp and wd passport 250GB hdd.
when i try to atach external hdd to my router, then i got this log:

Code:

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hub.c: new USB device 01:03.2-2, assigned address 8
usb.c: USB device 8 (vend/prod 0x13fd/0x160e) is not claimed by any active driver.
usb.c: USB disconnect on device 01:03.2-2 address 8

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i installed 1.9.2.7-10 firmware and usb flash drive (512MB) i mounted sucessfuly.

good news.

i attached hdd through usb hub with extra power and router found this disc.
looks like 500gp have limited power supply.