park heads from ext. HDD via USB?

[Tobias Kaboth <tobias.kaboth@xxxxxxxx>]

Hi all,
i use an external HDD (IDE) connected to USB. This is device /dev/sda1 with 
the scsi-emulation. The system is FC2.
If i want disconnect the HDD i umount it with success.
But how can i park the heads of the HDD? Do this umount automatically?
The tool hdparm don't work with SCSI (Emulation).
Do you know the trick?

Thanks,
Tobias
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