The hard drive has to be partitioned into at least two drives. Each can be loaded with a separate bootable operating system.
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There's no hard limit on the number of operating systems you can install. The limit will be dictated by the number of operating systems that support your hardware and the amount of space on your hard drive(s).
Requires that a special program be loaded into your boot sector. Try System Partitioner. Most operating systems allow you to partition your hard drive; you do not need additional software to partition your hard drive. TIP: Make the sizes markedly different so that it is easier to recognize which drive is which. Once you have partitioned your hard drive you effectively have two hard drives (or more if you want to). You can load one operating system on one drive and the second on the other.
It depends on the size of the disk drive(s) and what kind of bootloader you have. With the right bootloader you can put on as many as your hard-drives can handle.
Any computer with the ability to understand "partitions" can run multiple operating systems, albeit one at a time. Any computer with the ability to run virtual hardware (such as with a Hypervisor) can run more than one operating system simultaneously. The operating system must also support partitions or it will be unable to run on a hard drive with more than one partition.
Theoretically, as many as will physically fit on the drive. Some operating systems will only function with certain partitioning schemes, however. The bootloader used to select the different systems also plays a role. LILO only supports 16 entries, for instance. GRUB supports an "unlimited" number, but in practice is only physically capable of displaying a couple hundred entries (this can be worked around through complex chainloading procedures).It depend on your size of Hard Disk and how many Partition you have...As many as you can install Operation System.....