Cant See Windows Option

Hi,

I am new to the installation of Linux, and wish to install 3 different distro's on the same hard disk.

I have installed Centos 7 successfully as follows :

The /boot is /dev/sda2

/dev/sda1 is listed as unknown so i assume it is the Master Boot Record with Grub installed. I do obtain the option to boot to the various kernels after updating the OS.

/dev/sda3 is a Linux LVM with the various partitions i required.

When i installed the CentOS 7 the installer stated an error about the bootable partition - which was effectively /boot, so i moved this to /dev/sda2.

What i am not sure about is that if i want to install 2 other Linux OS's will i run out of /dev/sdaX assignments ?.

I read somewhere that there are 4 maximum that can be used a /boot (SDA1, SDA2, SDA3, SDA4), so does this mean i can only install one other OS ?.

Any guidance gratefully received. Thanks.

Regards,

Richard.

I have installed centos7 in my laptop but after installing i cannot boot into my windows OS .
Even there is no grub entry for it but my windows partitions are intake .

I have a Toshiba Laptop that had a Dual Boot of Windows 7 and Linux Mint 17 on it and both OS's worked fine. I've been wanting to use CentOS 7 as my primary OS so that I can become more familar with RPM management and proceeded to remove my Mint installation and replace it with the CENTOS 7 installation, and the install completed successfully. HOWEVER, here's my problem.....

When my laptop starts up, I don't see GRUB nor do I have any option of selecting whether to run Windows or CentOS. It automatically loads up Centos 7. When I do a 'sudo fdisk -l', I can see that SDA1 is an NTFS drive, and when I try the following 'sudo mount /dev/sda1 /media/Main\ Drive' I get an error message saying that I can't mount an NTFS drive.

Am I missing something or is there a way to access my Windows files from within Centos. I was able to do this with Mint without an issue, but unable to see any of my windows drives because I can't mount an NTFS drive.

I have no problem with keeping CENTOS as my only OS on this laptop, however, I do need to access the files from the Window's partition, and if anyone can help me to access my files, that would be totally awesome.

Thank you in advance for reading through this and for any help offered.....

Mikey

I have an old debian distro installed on hard disk. The distro is on sda1 partition. I also have Win7 on a seperate hard disk which is on sdb1.
When I boot up, GRUB bootloader opens up and gives me the option to select either OS.

So I recently installed a new debian distro and put into my sda2 partition.
But now when I boot up, GRUB only sees the new distro in sda2 and I can't access the distro in sda1 or Win7 in sdb1.

On one thread someone said mounting the partitions and then using 'update-grub' will resolve the problem.
I tried it and re-booted, but GRUB still only offers the newly installed distro in sda2.

Can someone help please?

hiiii all

I had installed Windows 7 on /dev/sda1 and /dev/sda2 and then I installed Centos 7.
Since then I cant find Windows entry in the Grub.
And i had tried to use all kind of solution found on the net I still cant see any entry.
I had edited 40_custom script adding:

cat <<EOF
menuentry "windows 7" {
insmod part_msdos
insmod ntfs
set root='hd0,msdos1'
search --no-floppy --fs-uuid --set=root FCDAE998DAE95006
chainloader +1
}
EOF

then this command grub2-mkconfig -o /boot/grub2/grub2.cfg

[root@localhost]# grub2-mkconfig -o /boot/grub2/grub2.cfg
Generating grub configuration file ...
Found linux image: /boot/vmlinuz-3.10.0-123.el7.x86_64
Found initrd image: /boot/initramfs-3.10.0-123.el7.x86_64.img
Found linux image: /boot/vmlinuz-0-rescue-93890f189dec4b309c004fdce969ca5a
Found initrd image: /boot/initramfs-0-rescue-93890f189dec4b309c004fdce969ca5a.img

then this
[root@localhost]# tail -10 /boot/grub2/grub.cfg
# the 'exec tail' line above.
### END /etc/grub.d/40_custom ###

### BEGIN /etc/grub.d/41_custom ###
if [ -f ${config_directory}/custom.cfg ]; then
source ${config_directory}/custom.cfg
elif [ -z "${config_directory}" -a -f $prefix/custom.cfg ]; then
source $prefix/custom.cfg;
fi
### END /etc/grub.d/41_custom ###
[root@localhost]#


Still cant find windows in grub
please help me with this guys
thanks

Hello everyone,
Recently, I installed Linux Mint 17 (Cinnamon) on my HP dv6 Laptop. During installation Linux was not detecting my original Windows 7 and was attempting to occupy the entire hard disk. So I used the "Something Else" option to manually create separate partitions for Linux (Previously I had allocated around 120 GB free space for Linux using Windows Disk Management). This installed the Linux but after booting it does not detect Windows 7 and directly boots to Mint. I have tried installing and updating the grub but it did not help either.
Please Help...

I had Kali and Linux Mint installed and erased Mint to install Centos7. Grub was totally deleted and I could only boot into grub recovery. Many hours of cussing later I got Kali back, I can see Centos filesystem mounted on my desktop and in disk utility. I never finished setting Centos up as I was rushed out the door which probably caused the problem in the first place, for some reason it's raid and although it's 2 harddrives they are not set up for raid and 1 is Kali and 1 is Centos. The Centos boot folder is still empty after running grub-install on it twice and it does not show in grub. How do I get Centos as an option?

I just got a laptop with a 500GB hard drive installed with a clean copy of Win 7. I'm trying to shrink the windows volume from windows using Disk management and it's given me 230GB. There's less than 15 gig being used by the win 7 install. I want to dual boot but not if it's gonna cost me half the disk! I followed suggestions from he http://skimfeed.com/blog/windows-7-f...ize-shrinking/ which freed up all of 280MB. Can anyone suggest how I can get more shrinkage out of win 7?

I have Windows 8.1 Update as my HOST operating system.
I have installed vmware workstation and installed on it the latest
version of CentOS (7.0) as Guest OS.

I have 8 GIG of RAM and have allocated to VmWare around 5GIG~.
HDD size is 30 GIG.
I also have de-fragmented the HDD.

From the beginning of the installation of the CentOS it was SLOW. It is NOT a sudden change or decline in performance.

Formerly, I had installd CentOS 6.4 which worked OK and had not speed problem while I just had allocated 1 GIG of RAM. Where do you think lies the problem?

Please Help,

I have a Windows 7 and Fedora 20 dual boot pc .
Today i deleted the fedora partition from windows disk management and then restarted my pc.
Now i am stuck in the 'grub rescue > ' screen ...... It is showing 'no such partition ' , after searching through the internet i tried these commands......

grub rescue > set boot=(hd0,msdos6)

grub rescue> set prefix=(hd0,msdos6)/*boot/grub

grub rescue> insmod normal (after this line ,i am getting the error , grub rescue > unknown filesystem)

grub rescue> normal

Don't know what to do ,but i want to get back to the windows os first ,also i don't have the windows or fedora live cd . My Windows recovery is stored in my pc hard drive....... plzz help so that i can resolve this issue