I downloaded Windows Server 2012R2 ISO trial file - named 9600.17050.WINBLUE_REFRESH.140317-1640_X64FRE_SERVER_EVAL_EN-US-IR3_SSS_X64FREE_EN-US_DV9.ISO .

After burning by Nero 12 (and even by Windows 8 image burning tool) , I got only one README.TXT file on the DVD disk,

with the text content:

This disc contains a "UDF" file system and requires an operating system
that supports the ISO-13346 "UDF" file system specification.

I tried to begin boot from this disk to install Windows server 2012 R2  , but I got the error message:

Couldn't find BOOTMGR

How can I solve this problem?

Regards,

Zvi

Try with WUDT

http://www.microsoft.com/en-us/download/windows-usb-dvd-download-tool

I personally no longer use DVD media. I use UFD instead and I recommend it to you.