Hello,
I do thank you for confirming Randomcoder's advice. I have already ordered the SSD. Yes, in fact I do need such a large disk space. When you sum the amount of space I have to carry with me : the software of course but many graphical components (icons etc.), customers documents of the opened projects and others, code snipets, many apks, many exe, SDK and so on...
In fact, I am filling about 500 MB in six months

and I do use some NAS for my backups