Visual SCSI Explorer application runs on the Windows 2000/XP/2003/Vista operating system platforms and is intended for people who deal with SCSI devices. Application functional interface is optimized for Medium Changer SCSI device. Raw CDB feature allows user to execute any SCSI command for SCSI device of any type. Application visualizes host SCSI configuration as adapter-device tree. It is possible to rescan SCSI buses and to see SCSI device insertion and removal. SCSI device firmware developers will be able to execute each SCSI command manually and to verify device functioning. Application shows binary outbound and inbound command data and parses them. Developers of SCSI initiator and target mode drivers for host bus adapters will find this application useful to test drivers. Application automates routine SCSI device test procedures using JScript and VBScript scripting languages. Application can run several scripts for different devices at the same time.