I have a question about the bootloader- i have been getting used to this new bootloader and all its options. The other day i chose the Image CRC option and wasnt sure what it exactly did- i did get the calculations screen but dont know why it took so long so i am wondering what else it did to my phone . I have searched all over the web and through the forums and couldnt get an answer to this- can anyone help me in explaining what exactly this option does?

Thanks