h7 - questions?

h8
- Assigned, due 4/6.

q8
- Due by midnight 4/7.
- Over lessons 9-12, things you have done on h7, h8
- Timed, 30 minutes

Devices
- block versus character devices

Virtual memory
- basic idea, why - security between processes, simplicity of memory model, limited memory
- basic idea, how - page tables, page fault, ...
- picture and more details -
  https://en.wikipedia.org/wiki/Virtual_memory

RAID
- basic idea - combine many physical drives into one logical drive
- basic idea - performance and/or redundancy
- note - abstraction
- levels: 0, 1, 5