recover MBR

For dual boot installation.

http://www.sysresccd.org/SystemRescueCd_Homepage

dd if=/dev/sda of=mbr.bin bs=512 count=1

http://www.digitalcitizen.life/create-usb-memory-stick-system-recovery-tools

http://www.sevenforums.com/tutorials/20864-mbr-restore-windows-7-master-boot-record.html

grub.cfg windows entry

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### BEGIN /etc/grub.d/30_os-prober ###
menuentry 'Windows 8 (loader) (on /dev/sda1)' --class windows --class os $menuentry_id_option 'osprober-chain-A8A8863CA88608D0' {
 insmod part_msdos
 insmod ntfs
 set root='hd0,msdos1'
 if [ x$feature_platform_search_hint = xy ]; then
   search --no-floppy --fs-uuid --set=root --hint-bios=hd0,msdos1 --hint-efi=hd0,msdos1 --hint-baremetal=ahci0,msdos1  A8A8863CA88608D0
 else
   search --no-floppy --fs-uuid --set=root A8A8863CA88608D0
 fi
 parttool ${root} hidden-
 drivemap -s (hd0) ${root}
 chainloader +1
}
menuentry 'Windows Recovery Environment (loader) (on /dev/sdb3)' --class windows --class os $menuentry_id_option 'osprober-chain-1ACA-FBDA' {
 insmod part_gpt
 insmod fat
 set root='hd1,gpt3'
 if [ x$feature_platform_search_hint = xy ]; then
   search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt3 --hint-efi=hd1,gpt3 --hint-baremetal=ahci1,gpt3  1ACA-FBDA
 else
   search --no-floppy --fs-uuid --set=root 1ACA-FBDA
 fi
 drivemap -s (hd0) ${root}
 chainloader +1
}
menuentry 'Windows 8 (loader) (on /dev/sdb5)' --class windows --class os $menuentry_id_option 'osprober-chain-6A18CDFA18CDC573' {
 insmod part_gpt
 insmod ntfs
 set root='hd1,gpt5'
 if [ x$feature_platform_search_hint = xy ]; then
   search --no-floppy --fs-uuid --set=root --hint-bios=hd1,gpt5 --hint-efi=hd1,gpt5 --hint-baremetal=ahci1,gpt5  6A18CDFA18CDC573
 else
   search --no-floppy --fs-uuid --set=root 6A18CDFA18CDC573
 fi
 drivemap -s (hd0) ${root}
 chainloader +1
}