Ok. My apology for not looking closer.
I know you're a very advanced user.
Thumb drive.That makes sense. It could download and/or install files corruptly also, which there is no control. At least you could make another ISO.
Did you thumb drive or DVD?
We should probably take this to another thread. You could ask admin to move the relative posts.
I se you are running a Samsung 840 SSD. Have you tried check the drive for malfunctions using the Samsung Magician software? You might also want to run chkdisk as well.
Samsung SSD (Solid State Drive) 840 series | Samsung SSD Website