thank for the update,i try go through tonight Below is what i had try Since FAT format is working, i try copy FAT content to hard disk 1st(about 881MB) then format the Corsair Pendrive with NTFS format and copy the FAT content from hard disk to the pendrive i hope it will work but it turn up that the pendrive wont boot Another similar try was i go through USB_MultiBoot5.cmd with NTFS format again(of coz it fail and the size about 8MB) then again i copy the FAT content from hard disk to pendrive however,the result same as above ,the pendrive just wont boot