我的 Debian 8 Pc 尝试在损坏的 USB 硬盘上启动，现在出现以下错误：
Attempting Boot from Hard Drive: unknow filesystem
Entrering rescue mode..
grub rescue >
我运行ls命令：
grub rescue > ls
(hd0)
(hd0, msdos5)
(hd0, msdos1)
(fd0)
ls (hd0): Filesytem is unknown
ls (hd0,msdos5): Filesytem is unknown
ls (hd0,msdos1): Filesytem is unknown
ls (fd0) : Filesytem is unknown
error : failure reading sector 0x2 from 'fd0'
我该如何修复它？