I would like to thank the developers of ERPXE for this useful tool.
I tried the Hiren's plugin, and it worked perfectly. But I wanted to use a recovery tool that is only available in Hiren's version 10.0 and no longer available in version 15.1, so I headed to the Wiki trying to create a custom image. It said I have to create an SDI Virtual Disk.
Spent a few hours trying to figure out what this is, and then I gave up.
However, I thought I could use Windows Disk Management and create a virtual disk in a VHD format (which was easy, since it is already included with Windows 7 and 8, and there are tons of tutorial on how to do that online) then I continued with the instructions in the Wiki. Then I tested it on my two computers at home, and it worked.
I tried to edit the Wiki, but I can't find a way to do that. So I thought that I could share my experience with the readers, and maybe the Admin could add that info in the Wiki.