not a bug just a question

[dup]

Hi, 
i have already install grub on my machine, but after i reinstall all the
system (Linux, Windows), i can't install grub.

I ve made it many times but now it don't want with error 27 (i think) where it
says that it can't write to the disk. 
Please why it does this or what mean this error exactly ?

Thanks !!


PS : i want to say that grub is very good bootloader, continue in this way.

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