i had this problem. OS3.5 and 3.9 install a cd dos driver in devs/ dosdrivers,called cd0 or cd1. if you drag this dosdiver over editpad in your dockbar you will see that it uses the cachecdfs filesystem and scsi.device or atapi.device. these are incompatible with asimcdfs filesystem and asim_atapi.device: you cannot have both a dosdriver from os3.5 or os3.9 AND asimcdfs in devs/dosdrivers, its either one or the other so put one of them in storage. cachecdfs, the cd filesystem installed by os 3.5 allows you to mount multisession cd's but asimcdfs does not, BUT with asimcdfs you can read audio cd data as amiga files in various formats eg little endian (good for converting to mp3), big endian 8 bit aiff mono or stereo so these can be copied anywhere to hardrive. you can also do this with utilities on aminet but i think its a nice touch that asimcdfs supports it automatically. don't apologize about asimcdfs's age: its still one of the fastest most reliable systems..