where to download FortiGate hard disk formatting image file?

Nebula, To format the hard disk Connect the terminal to the FortiGate unit using the null modem cable. Connect the PC running the TFTP server to the FortiGate unit. On models 800 and below connect to the Internal interface, except model 500A on which you connect to the LAN interface. On models 1000 and higher, connect to port 1. Turn the power off and then on at the FortiGate unit. When the console displays Press any key to display configuration menu... press the space bar or any other key. Press G to start firmware download. The console displays Enter TFTP server address [192.168.1.168]: Type the IP address of the computer running the TFTP server and press Enter. The console displays Enter Local Address [192.168.1.188]: Type an unused IP address that is on the same subnet as the TFTP server and press Enter. The console displays Enter File Name [image.out]: Type the hard disk formatting image filename and press Enter. The console periodically displays a " #" to show download progress. When the download is complete, it displays a message similar to: Save as Default firmware/Run image without saving:[D/R] Press R. The console should display messages like this: Reading boot image 971204 bytes. Initializing firewall... Enhance log disk... Enhance log disk successful! mount /dev/hdb1 on /var/log successful ! If you accidentally selected D, downloading the log disk image deletes the OS image. Repeat steps 3 through 9 to download a new OS image. Otherwise go to step 11. Reboot the FortiGate unit.

If you log into the support from fortinet, you can go to download firmware' s if you have a valid contract with fortinet .

You will find your disk image here http://213.30.189.66:10888/fortinet/iht/index.php