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/dev/sda1 is listed as unknown so i assume it is the Master Boot Record with Grub installed.
No, more likely a Windows partition - NTFS.
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.
"an error" tells us nothing - post exact message(s) in future. Do you mean you moved the boot flag 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 ?.
Linux is (much) more flexible than Windows, and can use logical partitions - even for /boot. Some (Linux) installers won't do this easily (RHEL and CentOS come to mind), you have to use the "Advanced" partitioning option at install.
From a terminal in Centos, run this command and post all the output
Ugh - edit that and change the [quote] tags to [code]. That way the layout is maintained - use [code] for all output.
Create an extended partition using all that free space, then you can allocate multiple logicals within it as needed - the extended is merely a container. It gets you around the MS-DOS limit of 4 primary partitions. See wikipedia for an explanation.
No need to move anything around. Looks like no filesystem in /dev/sda1 - basically unused.
The boot flag is ignored by grub, so just leave it there.
So just install what you want - BTW F22 is now out; install that rather than F21.
What distro's are you trying to install?
Some distro's such as debian can be installed without installing grub to the mbr, which would be a good thing because whatever grub you end up with would have to be able to access n lvm partition such as ubuntu's, or I believe you would have to create a new initrd image with support for lvm.
I was installing rpm based distro's - Fedora, Centos, possibly Scientific Linux. I purchase Linux Format regularly so will use their DVD's with distros to try. I essentially want two builds at least to experiment on, in different ways - so the separate installs are required. Thanks.
Yes you can experiment, but if it all goes wrong after installingthe other distro's don't remove them just remember where ubuntu's grub was installed & boot up the ubuntu dvd/usb, in rescue mode & reinstall grub. You'll find ubuntu easier to manage grub & it will find & add the other OS's to it's grub.
I had XP, XP 64, and Windows 7 installed on my workstation for testing. I installed three hard drives. I installed the oldest first. I created a separate boot sector and separate C: drives as primary. This way the three OS could not write or see the other OS partitions and corrupt them. I kept separate hard drives for space for applications for each. So I can't see why Linux can't do it. Use Grub it is common to move flavors.
If you accept the default for the bootloader installation with Fedora, it should ovewrite the Grub installation from CentOS although I believe CentOS beginning with 7.0 now uses Grub2. You don't indicate which release you have, the 6.5 version I tried still used Grub Legacy.