Hello, Build system Windows 7 Ultimate. I have a main 500MB WD Caviar Black ESATA 3G with a Lite-on DVD/CD Writer on pata master. I had a second 100MB WD Drive installed as the pata slave with files to copy to the main drive after installation of operating system completed. BIOS shows the SATA Drive and the DVD player but refuses to boot, with a place disk with system files in cd and hit enter. When I replace the slaved drive, it boots normally. BIOS says the WD 500 MB Caviar black hardrive as the boot drive. Can anyone please assist. I will certainly appreciate it. Thanks in advance. Glenn3333

I'm trying to understand your situation. Please confirm or deny I'm reading this right. You have a 500GB drive and a 100GB drive. You installed Windows 7 on the 500GB drive and you want to copy files from the 100GB drive to the 500GB drive. Correct so far? And when you try to boot with the 500GB drive and the 100GB drive both connected to the system, it won't boot? But if you disconnect the 100GB drive it boots fine? In Disc Management, are these drives showing as Disc0 and Disc1, and as C: and D: for the 500GB and 100GB drives, respectively?

Hi, May I know if there were any errors appeared when the boot failed? I also suspect this issue should be related to that the “bootmgr” or MBR is missing, please try the following method and see if this can be fixed: Startup Repair: frequently asked questions Windows Vista or Windows 7 no longer starts, and the Startup Repair tool does not fix the problem Thanks. Nicholas Li - MSFT Please remember to click Mark as Answer on the post that helps you, and to click Unmark as Answer if a marked post does not actually answer your question. This can be beneficial to other community members reading the thread.