Option: X5409A. Sun 16X DVD-ROM / 48X CD-ROM 1 5/8" ATAPI/IDE Interface. 16X DVD-ROM / 48X CD-ROM. Specifications for the XJ-HD166S are 16x DVD-ROM and 48x CD-ROM. Specifications for the SD-816 are 16x DVD-ROM and 40x CD-ROM.
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