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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.....

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Where is operating system?

The operating system on a computer is installed on your hard drive, usually under c:


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What partition is the active partition of the hard drive?

The system partition(a partition where the operating system is installed) is the active partition of the Hard Drive


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If you want to format a hard drive where Os was installed there is no way how you can do. It's actually impossible.


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The hard drive has to be partitioned into at least two drives. Each can be loaded with a separate bootable operating system.


How can you fix your PC that shows when turned on operating systems no foundi do not have boot disc and the recovery system won't work either?

Reformat the hard drive Reformat the hard drive


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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.


Why is the operating system installed on the BIOS?

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How many operating systems does Hard drive support?

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