With the receiver opened, of course:
1- Turn on the receiver, without antenna connected, and wait until the HDD turn on (waiting for the Hdd noise), the hard disc turn on by command, not only by applying power to it.
2- After a little while, the heads are quiets, but the Hdd is on. Disconnect the Sata data cable only (leave the hdd power connected). Be careful not to touch the silver seal, it breaks easily
3- Connect a Sata cable, from an Usb external Hdd enclosure, and connect it to your Pc. Now you'll have access to the hard disk. I tried to repair it but it would take several hours, and as I have not programs to loose, I decided to deleted all the partitions using Windows hard disc manager.
4- Now, safely remove the hardware from the pc. Disconnect the power from the receiver. Put back the receiver Sata data cable. Thast it. When powering on again, it will tell you that the Hdd will be formatted.