On Saturday 09 August 2014 11:23:10 Alan McRae wrote: > No problems Joe. I have done this multiple times. > > I assume you have Fedora 20 on sda (the first disk) with > the bootloader (grub2) on sda. Your BIOS will be set to boot sda. > > You install CentOS 7 on sdb (obvious). > > Your options are with the bootloader (grub2). If you install > the bootloader on sdb the two systems will remain separate. > You will have to change the BIOS to boot either sda (F20) or sdb > (C7). > > The way I prefer would be to install the new bootloader on sda > (overwriting the current configuration). > Your BIOS will still boot sda which will take you into > the grub2 menus which will show both Fedora 20 and CentOS 7. > > You need to be aware that in the above configuration sda will > boot into /boot on sdb (C7) which will have the dual boot menus. > Don't wreck this directory or you won't be able to boot F20 > (easily). > > The F20 and C7 installers are very good. They scan the disks for > linux and Windows installations and add them into the boot menu for > you. > > I have a laptop which boots C7, C6, F20, XP and 3 versions of > Android using grub2. > > Alan > I'v been trying to dual boot windows 7 and CentOS 7 for a week now without any luck. CentOS 5/6 and Fedora 20 recognise the Windows installation and place an entry for it on the boot menu. CentOS 7 anaconda recognises the Windows 7 ntfs partition at installation time as unknown but doesn't place an entry for it in the grub2 boot files. Did you install CentOS 7 last. Tony -- Linux nogs.tonyshome.ie 2.6.32-431.23.3.el6.x86_64 #1 SMP Thu Jul 31 17:20:51 UTC 2014 x86_64 x86_64 x86_64 GNU/Linux