Usually, just one, but I don't think you should have more than one. I think it is possible to have Windows and Linux on one hard drive. well it also depends if you want to have more the 1 partition. The way to do that is to format the disk or at the start of installation process you change the amount of memory you want in your C drive and with the extra memory the can make a new partition. But if you have to many partitions you can really mess up how your computer boots up.
The OS is stored in the Hard Disk of the computer.
You can use 500 GB hard disk & install OS 2000, but you won't be able to avail 500 GB hard disk space on it.
There are a number of reasons why this will happen - Install Mac OS onto WinTel machine, Install OS for IntelMac on Power PC mac clone, Install Win7 onto WinTel machine that has not enough RAM or Hard Disk space to enable the install. Simple question, complex answer
The hard drive is not configured to your PC's settings. Re-install the OS on the new HDD.
Mac OS X install media is a repair disk that allows you to re-install the operating system on your Mac in case of hardware failure or repair. You don't have to have a physical install disc, because OS X is built in your Mac.
The OS has to keep track of the physical location where a document is saved on your hard disk; to do this, it maintains the file allocation table (FAT).
Usually it is installed on your HDD (Hard Disk Drive).
RAM and Hard Disk both are memory storage devices. Which OS you have on the machine in question ? Gabriel winadmin.co.uk
When you first install Ubuntu, it will walk you through the steps to install it and keep your other OS installed. Then when you boot your dual-boot system, you can simply select Ubuntu.
Go to the Apple Store and buy a Leopard Retail Disk. These can cost about $129. Then pop in Install Disk 1 and follow the on-screen instructions. When prompted, insert Disk 2 when Disk 1 pops out.
Around $50.
It improves performance because it wipes the data from and old OS install so the old files dont corrupt the new OS install. Having a "clean" drive also improves laoding speeds because it doesnt have to figure out which files to boot with.