Thanks for the replies. So, I installed server essentials on to the Boss card and then everything was set up , I went into the windows menu to initialise the disks. Then downloaded all the drivers via Internet Explorer. All working now. The 4 HDD are showing as part of "This PC" in the menu. I used RAID 10 instead of 5.
Hi, I have a T140 with a Boss s1 card with two 240 gb m2 drives and four 1TB hdds installed in the four bays. I have the bios set to UEFI and SATA set to RAID mode. The hdds are set to raid 5 and the boss to raid 1. I have upgraded the firmware via the idrac and virtual booted the iso file. It is fine up to this point. Windows installs and then I choose manual install. Both the m2 drives and hdds show up at this point. There is nothing else showing. ie recovery drive etc. I install windows on the m2 drives and go through the install. Windows then loads but the HDDS aren't showing. Only the m2 drives on the boss card. Hence everything is loaded onto the m2 drives which I don't want. I only want the os on the m2 drives and storage (pics/vids etc) on the HDDS.  What am I doing wrong? 
Problems with Windows server install and SATA hdd