The NOS Toshiba XM-5401B 5.25 inch SCSI 4x CD-ROM Drive is a vintage internal CD drive that offers reliable performance. With its compact form factor and trusted Toshiba brand, this CD-ROM drive is sure to enhance your computer's functionality. The 4x write speed and SCSI interface provide for efficient data access and storage, making it a valuable addition to any system requiring a CD-ROM drive. Note: these were sold as an upgrade kit for DTS cinema processors. They were never used and found wrapped in a box that was originally sealed. Any questions, just ask. Thanks.