Classic disappears


Super Bull
I have 3 HD's, 20Gb MainHD and 9.1, 4Gbwith OsX and 9.1, and 2Gb without system. This day I use a fresh install copy of MacOs 9.1 in 4Gb HD to run with Os X. But two days ago this system (Os9.1 on 4Gb) disappeared to run. I explain... the system folder exist, but in Classic control panel is not avalaible to run, only appears my OS 9.1 on 20Gb HD.

What happened??