What happens when a Mac SATA drive is put in a Dell laptop? I am planning to buy a Mac. But I see Mac uses same Intel processors as other Windows/Linux laptops. So I would like to know if I take a hard disk(say the Mac book is released before mid 2012, so the hard disk is not soldered) from the Mac book and use it in any other laptop (say a Dell) that supports the same size HDD. 

Is this possible? Have any one tried. Please help me.
It depends on what you mean by "use".


You may access files on that drive from Windows/Linux, provided you have driver for HFS+ filesystem (Linux could have it already installed, at least in read mode, Windows driver must be downloaded separately). (i.e. the hardware is 100% compatible - and would run well if you reformatted the drive for Windows / NTFS).
You certainly will not get the Dell to boot OS X simply by moving the parts. OS X has very limited drivers and they are tailored strictly to Mac hardware.