Alan Parekh Hard Drive Clock
Jason Amsel and Konstantin Klitenikfrom Hard Drive Clock
Ian Smith Hard Drive Clock
Waldeck Schutzer Hard Drive Clock (translated version)
Baidu Hard Drive Clock (translated version)
You too can build your own design with numerous features like – adding a nice touch screen that can be used to set the time, adding clear position indication etc. For this you will just be requiring an old hard drive, few LEDs, an old clock, a microcontroller, few electronic components and some mechanical parts.