There exist a few solutions (WOL clients) to wake up your HDA from a Mac OS X computer. In order to wake up your HDA while booting your Mac you may use NASwake (ref. http://trick77.com/2010/12/22/wake-nas-at-boot-time-wake-on-lan-wol/). It comes ready to use as an installable package, you just need to enter the MAC-adress of the HDA.<br><br>
WakeOnLan is a freeware application provided by Readpixel which offers a very comfortable way to wake up your HDA directly from your Mac OS X desktop (ref. http://www.readpixel.com/wakeonlan/index.html).