Fred, I don't imagine you can easily, or cheaply, upgrade a 2X CD-ROM to a 4X. On the other hand, You can get a 4X SCSI CD-ROM for a little over $200 that will install in your dock II (I think, it needs a 1/2 height bay). I installed a Sony CSD-760S into by 1/2 Height Bay in my Dock II with no problems. Good luck. Joseph C. Wilson jcwilso@ibm.net Badger Valve & Fitting Milwaukee, WI