how to get serial_no from usb HD disk (HDIO_GET_IDENTITY ioctl, hdparm -i)

[Yakov Lerner]

How can I get serial_no from usb-attached HD drive ?

The HDIO_GET_IDENTITY ioctl fails (like 'hdparm -i').
Any advice on how to extract the drive serialNo from the usb disk ?
Can I write kernel module to extract the SerialNo ?
(I don't need whole 'struct hd_driveid', only the SerialNo).

Thanks
Yakov
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