我的UNIX5.05的光盘刚启动，停在Boot后，Press Enter很快就报错，正常应该是
fd(64)unix root=ram(7) ram.preload=7 swap=none dump=none nbuf=2
@ram.fd=254 ramdisk=ffd(64)rootFS
而现在却是
fd(64)unix root=ram(7) ram.preload=7 swap=none dump=none nbuf=2
@ram.fd=254 ramdisk=ffd(64)rootFSHearder read error:-1