ya but how the Disc image is stored in SD card….we cant install Windows on SD card ..why in Raspberry only…Whats the whole process….how the source they compile in that small size….
I already posted the reason for choosing SD Card. Windows will not work with Raspberry Pi. Operating system is working on Hardware. So hardware must be compatible with Operating System. We can only use OS customized for Raspberry Pi
Your questions are going outside the scope of this topic. You can open a new topic for asking such questions.
Size depends on the Operating System you are using. You can check sizes of different operating systems. You may customize it to reduce size by removing unwanted features. If you want to customize Linux, please go to a Linux forum.
But there is no relation with Operating System Size and SD Card. SD card is chosen because of its advantages. Up to 512GB SD cards are available in the market.