Q:

Are there any other way to restart to recovery HD

I tried to restart while keep pressing Command-R
However, my keyboard is not mac keyboard.  There is windows-R. It works exactly like Command-R in all circumstances. 
Well, I keep failing to get into recovery HD.  I need that because I want to repair the main disk. 

Error: This disk needs to be repaired using the Recovery HD.  Restart
  your computer, holding down the Command key and the R key until you
  see the Apple logo.  When the OS X Utilities window appears, choose
  Disk Utility. 

What should I do? 
I have a flash disk.  Can I turn that into recovery HD? 

A:

Try this alternative way (explained at macworld.com):

Start you Mac while pressing the Option key (in your Windows keyboard press the Alt key) until the Startup Manager appears:

One of the volumes will be called Recovery HD. 
Select Recovery HD and then click the upward-pointing arrow below it to boot from Recovery HD.  
After a brief delay, you’ll see the Mac OS X Utilities screen.  Select Disk Utility to repair your disk:

A:

Note for other who come across this thread.  To get into Internet Recovery Mode I used WINDOWS + ALT + R on my 2011 Mac Mini while powering back on.  CONTROL + ALT + R did not work for me with a Windows Keyboard (USB). 

A:

I tried this with a bluetooth windows keyboard and the ALT key on the left side of the space bar worked for me.  I did not press any other key. 
One more thing: it did not work when I did a soft restart; I had to power down, hold the ALT key, then power up the mini. 