SHSUCDX (ver 3.09) Freeware This IDE optical drive (CD-ROM, DVD-ROM) driver was written by Jason Hood. The driver TSR is a direct replacement for the Microsoft MSCDEX driver, but it uses just half the system memory. SHSUCDX assignes DOS drive letters, and is used in conjunction with the IDE optical drives physical driver (such as VIDE-CDD.SYS). Use SHSUCDX.COM if possible. SHCDX86.COM is for 286 processors.