i just want to clarify because people are going to say that doesn't make any sense, but it does. we're taught that ram disappears on a reboot, but it doesn't actually. it's just discarded and written over. reusing the information in ram just means going back to where it was and finding it.

so, all the os has to do to reuse the boot information in ram is make sure it never writes in the sector that it assigns for boot.

but, again, it's the cpu cache i'm hypothesizing about...