用移动硬盘安装WIN7 出现NTLDR is missing 升级NT6 出现以下提示

D:>d:bootsect /bt60 f: /mbr

bootsect {/help|/nt60|/nt52} {SYS|ALL|:} [/force]

Boot sector restoration tool

Bootsect.exe updates the master boot code for hard disk partitions in order to
switch between BOOTMGR and NTLDR.  You can use this tool to restore the boot
sector on your computer.

Run "bootsect /help" for detailed usage instructions.

求大神帮忙 十分感谢