Just an FYI, when applying patch 4.01, I ran out of space on my 40gig SSD and patch would not complete. I've tried copying it to my main hard draive (300gig extra space) and running the update there. Note, you will need to re-start from launcher or update will still try to apply to the ssd drive (it doesn't realize it got moved and points to the ssd still for update).

Hopefully it will go well and I can then move wow back to my SSD. I believe wow currently takes up 21 gig of my 40 on the SSD. They must really eat up extra space on this patch.

Let me know if anyone else has any tips, i tried loooking through old patches and all the big ones I have deleted.