Vey important problem :( help me!

[Milad Eghdami]

Hi
i have this
error's of my site's
1- error : Got error 28 from storage engine - 1030
( I check the space of the server ) the server hard is 500gb and 450 gb is free and you can see this sample site : http://www.rayan-computer.com
2- this error :
Warning: Unknown: write failed: No space left on device (28) in Unknown on line 0 Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct () in Unknown on line 0
example site : http://www.infoneteng.com/fa/

please help me to resolv this problem

thanks a lot