So, I created a 15 GB disk image and speed tested it on my hard drive. I got write speeds avg. 60 MB/s and read speeds avg. 60 MB/s. So then I took the image and placed it on a thumb drive. It read at the same speeds as the thumb drive which were 60 MB/s and 165 MB/s. So then I raided two 32 GB thumb drives and the writes went down from 60 to 40 but the reads went up to 310. So, then I copied the disk image from the 2 raided drives and copied it to a 64 bit drive. I opened the disk image from the thumb drive and speed tested it. It ran at the same speed as the 64 thumb drive. I also learned that you can RAID 0 disk images together to get one raided disk image. You can then copy that disk image to whatever drive you wish. You can also raid those raided images together. So, it would be interesting to see a couple of raided disk images on one drive raided to another set on another drive. Raiding the disk images is possible using the mdadm command in linux which i found out the the mdadm command can be used on a Unix system as well but I don't know if there are variations as to what it does on Unix vs. Linux. There is another program that raids together raid sets but it looked like a Windows program from the looks of it.
The infö can be found here------->https://askubuntu.com/questions/663027/create-raid-array-of-image-files
The info can be found here------->https://medium.com/dfclub/how-to-combine-raid-array-images-in-encase-836856cfd893
All I have to say to this is
REALLY? after all that arguing and fighting and dismissing correct answers, you could have just explained that this is what you wanted to do, which is NOT USING HARD DRIVES, but instead of just answering some questions you had to be antagonistic to everyone here who wanted to figure out what you are doing and why, to properly answer your question.
And in the end if you moved your experiment from thumb drives to actual hard drives, the performance would tank, the only reason you are seeing performance improvements is due to using a thumb drive (or SSD).