I wanted to setup a dual boot for Windows 7 and CentOS 7
I had a Windows 7 machine with 500GB disk. I shrank the Windows partition to provide space for CentOS 7 (roughly 230GB). I created a USB CentOS 7 netinstall stick and booted from that. I ran the install configured as best I knew to install CentOS 7 into the free space (rather than over the whole disk). I did the net install and all seemed to go well but when it rebooted I was back into Windows and can't get into CentOS.
I've rebooted from the USB and tried to fix the situation (carefully) using
cfdisk, e.g. selecting what I believe is the CentOS boot partition but it reports "missing operating system." Also
cfdisk says it can't reread the partition table when I write it with CentOS boot but starting
cfdisk again seems to show the flag has been set.
Currently the USB CentOS 7 netinstall shows me the following partitions on the disk:
## DATA /home 168GB centos-home ## SYSTEM /boot 500MB sda3 / 51GB centos-root swap 3.85GB centos-swap
The "other" Windows partitions are:
ntfs 100MB sda1 ntfs 253GB sda2
This looks ok BUT when I go into CentOS 7 Installation again it is telling me I have to create mount points for the root partition. I didn't do this originally as I thought it would be done automatically when I clicked "Click here to create them automatically" for the disk setup the first time I installed.
And the partition table accessed using
cfdisk from "Rescue a CentOS system..." looks like this:
Unusable 1MB sda1 Primary ntfs 105MB sda2 Primary ntfs 265GB sda3 Boot Primary xfs 525MB sda5 NC Logical LVM2_member 235GB Logical Free space 0.03MB
As mentioned, when I try to boot with this configuration I get "missing operating system." If I change the boot flag back to sda1 then it boots into Windows 7 fine.
grub2-install from netinstall on
/dev/sda and now when I boot from the disk I get the
grub prompt. I can using it to chain load into Windows. However, when I try to boot into CentOS 7 I get some sort of trace/dump.
linux (hd0,msdos3)/vmlinuz-3... root=/dev/sda3 initrd (hd0,msdos3/initrd-plymouth... boot
NOTE: I believe
linux is the primary boot partition for CentOS
Trying the above just crashes.
I installed NTFS-3G and NTFSPROGS using
yum from the EPEL repository.
grub2-mkconfig -o /boot/grub2/grub.cfg and then rebooted to find Windows 7 (Loader) in the boot menu. But when I choose it I get:
error: no such device 978778... error: hd1 cannot get C/H/S values....
which doesn't sound very good at all, but at least some progress.
I should also say that I now have CentOS 7 only on the internal drive and I'm working on this drive as an external USB drive (hence
Can someone please help me to get Windows to boot?
I have a Unix background but mostly use Mac OS X. I always come unstuck on setting up Windows and Linux dual boot.
Finally, I have CentOS 6.5 system running fine on another machine, as well as my Mac.