Yeah, it doesn't seem like it's a problem with DOS 7 in particular, but possibly just DOS in general with this game and with only certain optical drives. Still weird, though, that the game works fine in Windows, but real mode DOS bugs the drives out. Makes me think there's an underlying incompatibility somewhere in the CD drivers but I can't seem to go around that. I think I'll just get another drive and hope that it works, they're pretty cheap.
And I don't have any other HDDs to use, I've just got one per system. And yeah, definitely not a problem with TR not liking DOS 7 as it's fine with a drive in another system.
Pentium MMX 233 | 64MB | FIC PA-2013 | Matrox Mystique 220 | SB Pro 2 | Music Quest MPU Clone | Windows 95B
MT-32 | SC-55mkII, 88Pro, 8820 | SB16 CT2230
3DFX Voodoo 1&2 | S3 ViRGE GX2 | PowerVR PCX1&2 | Rendition Vérité V1000 | ATI 3D Rage Pro