Previously IDE CD-ROM (also CD-R, CD-RW, DVD) devices weres handled by IBMIDECD.FLT and all other ATAPI devices (like LS-120 and ZIP) were handled by IBMATAPI.FLT. Now all ATAPI devices are handled by single driver IBMATAPI.FLT. For backward compatibility this package provides both IBMIDECD.FLT and IBMATAPI.FLT. In fact, this is the same driver and if both drivers are in config.sys only the first one in the config.sys will be loaded. It is recommended to use only IBMATAPI.FLT and remove IBMIDECD.FLT from config.sys.