我有以下磁盘配置：
Disk /dev/sda: 750.2 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders, total 1465149168 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disk identifier: 0x28ec8922
Device Boot Start End Blocks Id System
Disk /dev/sdb: 256.1 GB, 256060514304 bytes
255 heads, 63 sectors/track, 31130 cylinders, total 500118192 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x72654d40
Device Boot Start End Blocks Id System
/dev/sdb1 * 2048 206847 102400 7 HPFS/NTFS/exFAT
/dev/sdb2 206848 62914559 31353856 7 HPFS/NTFS/exFAT
/dev/sdb3 62914560 167772159 52428800 7 HPFS/NTFS/exFAT
/dev/sdb4 167774206 284358655 58292225 5 Extended
/dev/sdb5 167774208 168357887 291840 83 Linux
/dev/sdb6 168359936 218357759 24998912 83 Linux
/dev/sdb7 218359808 268357631 24998912 83 Linux
/dev/sdb8 268359680 284358655 7999488 82 Linux swap / Solaris
Disk /dev/sdc: 24.0 GB, 24015495168 bytes
255 heads, 63 sectors/track, 2919 cylinders, total 46905264 sectors
Units = sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x28ec8923
Device Boot Start End Blocks Id System
上/dev/sdb，我有两个Windows 7安装，/dev/sdb1是Windows系统分区，/dev/sdb2是第一个Windows 7安装，/dev/sdb3是第二个Windows 7安装。其余分区是Ubuntu 14.04，我使用的是Grub。 grub 菜单仅列出了 Windows 加载程序，我必须进入 Windows 加载程序才能选择要从中启动的 Windows 安装之一。是否可以在 grub 菜单中列出 Windows 安装？
我尝试使用以下 Grub 自定义菜单，但是当我运行 grub-update 时，它没有检测到任何操作系统：
#!/bin/sh
exec tail -n +3 $0
menuentry "Ubuntu" {
recordfail
load_video
insmod gzio
insmod part_msdos
insmod ext2
set root='hd1,msdos5'
search --no-floppy --fs-uuid --set=root /dev/sdb5
linux /vmlinuz-3.13.0-24-generic root=UUID=/dev/sdb5 ro recovery nomodeset
initrd /initrd.img-3.13.0-24-generic
}
menuentry "Windows Lab" {
insmod ntfs
set root='hd1,1'
search --no-floppy --fs-uuid --set=root /dev/sdb2
chainloader+1
}
menuentry "Windows Personal" {
insmod ntfs
set root='hd1,1'
search --no-floppy --fs-uuid --set-root /dev/sdb3
chainloader+1
}
如何获取grub列出 Windows 7 安装的菜单？