yes but for a mac you don't have to format hard drives... so if you were to put a mac hard drive into a PC you would have to reformat it, I'm not completely sure how to do that
Software written for Mac OS X will only work on a Mac running Mac OS X it will not work with other operating systems such as Windows.
Only Mac OS X will work on a Mac, and PC's are traditionally Windows-based.
Mac OS X - legally. Some people have altered the code in Mac OS X so that it can run on PC hardware (Hackint0sh)
Os X is the operating drive on which a Mac and any apple device functions on. When there is an Os X on a PC it means that it is compatible with devices from apple.
Legally Mac OS X can only be installed on computers made by Apple. Some people have had success installing it on other computers.
Mac OS X PPC is a version of Apple's Mac OS X operating system that runs on Power PC (PPC) architecture. This is opposed to Mac OS X for X86 which runs on Intel-based Macs. Mac OS X 10.0 through 10.5 can run on PowerPC based macs whereas Mac OS X 10.6 Snow Leopard will only run on Intel-based Macs.
Xbox 360, PC, iPhone OS, and Mac OS X
Apple's Mail application is only available with Mac OS X and will not work with a PC running the Windows operating system.
No. iChat is only written for Mac OS X.
Of course cannot
Providing the PC has been made by Apple then it is perfectly legal to run the Mac OS on it. The legal terms and conditions for Mac OS X prevent it being used on non-Apple hardware.
To comply with the legal agreement you agree to when installing Mac OS X the PC needs to have been made by Apple.