Nope, I do this all the time!

Nah I do that too

My notes usually include diagrams

I write my notes, the act of writing them helps me remember them

I actually physically write all my notes and save any essays I've typed on said computer... my old computer had 300+ essays on it but the HD had a meltdown and I couldn't salvage them. With the physical note copies it's also because I like my doodles... with my essays it's just that they are good essays. My favorite one is for an english professor who told us it would be impossible to ever get a 100 in his class.... I turned in a 7 page essay on genetic engineering and got a 100 even though it had like 50 grammatical errors. It was such a perfect idea he couldn't help it. I was proud to say the least.

And I'm excited to delete them too.

Nope. It's in my phone too