problem with disk activity usage

Hello ,

I'm facing trouble with running multiple VM guests on VMware workstation , the problem is that I have 4 VM guests that  I need to run at the same time , whenever I start to power up any of them, the disk activity is reaching to 100 present of the actual size as shown in the picture

I have allocated only 80 GB to each guest so I dont know why the disk activity is reaching to 100 percent of my hard drive (1TB) and that is making my laptop very slow

any advice on how to reduces the disk usage ?

thanks in advance