It is enough to install a 128G SSD. Installing common programs such as solidworks UG CAD into the solid-state hard disk can significantly improve the notebook. At present, most notebooks on the market will lower the overall performance because of the slow reading speed of hard disk. My notebook was 4 years ago, and I just changed the solid state drive. Compared with the current mainstream notebook, it feels little different. I hope I can help you!
In addition, if the CD-ROM drive is not commonly used, you can change the location of the CD-ROM drive to the original place of the hard disk and install the solid-state hard disk. Taobao, the hard disk bracket in the CD-ROM drive, is very cheap. I hope I can help you.