Thanks for posting!  The Dell Server Update (SUU) DVD is not meant to be bootable.  It is intended to run from inside Windows.  If you want to run your updates in a non-OS environment, you can use the System Management Tools & Documentation (SMTD) DVD to boot the server, then use the firmware update option and put in the SUU disk when prompted.  You will still need to update the drivers separately. Part of the reason for this is the SUU shouldn't update drivers on the OS if the OS is not running.
I assume that Dell has split the DVD image into two parts to accommodate FAT32 users, but it really makes me think that they are making it difficult to download the updates so that users will pay for the regular CD shipments when they purchase hardware. I downloaded the OM_6.1.0_SUU_A00.001.ISO and OM_6.1.0_SUU_A00.002.ISO files and then followed the directions to make a DVD ISO. I tried both Unix and Windows methods, and the DVD is readable but not bootable... on any machine! After I burn it, Windows opens the DVD just fine, and it starts to collect info about the machine, but I can't boot from it. How can I make this joined DVD burn to bootable? Here are the directions in the text file on the downloads page:------Download all ISO file segments into an empty subdirectory on your local hard drive. After you have downloaded all the file segments, run the following command to create the ISO file:copy /b OM* OM_610_SUU_A00.iso [Windows]cat OM* > OM_610_SUU_A00.iso [Linux]Note: If the wildcard format above does not bring the file segments in the right order, run the following command instead to create the ISO file:copy /b OM_610_SUU_A00.001.iso+OM_610_SUU_A00.002.iso OM_610_SUU_A00.iso [Windows]cat OM_610_SUU_A00.001.iso OM_610_SUU_A00.002.iso > OM_610_SUU_A00.iso [Linux]Use your DVD burning software to create a DVD from OM_610_SUU_A00.iso.------ I followed the above directions, but it won't boot. 
openmanage dell server updates OM_6.1.0_SUU joined ISO won't boot!!!