Can no longer access my second drive


After installing OSX on my B/W G3, my second drive "Dan's Disk" no longer mounts in OS9. It was HFS format, and I can access it in OSX, but when I go back to booting from OS9, the disk is no longer available. When I do a Sherlock search, it will search this drive, but I can not get anything because it is invisible. When I boot in OS9, I can look at Macintosh HD and there is now a folder called "Dan's Disk" but it contains some obscure file that I am sure is related to OSX so that that drive can be read. I would like to get at that HD in the OS9 environment, but nothing seems to work. Thoughts??