My MS Surface Pro only has a 64 gig C drive which has always been just fine until the one big Windows 10 update came out.

I kept putting it off & putting it off until finally today I got sick of the reminder. It told me I didn't have enough hard drive space & one option was to connect an external hard drive. I'm like "allright, I can do that" & dragged out a 3 terrabyte external hard drive & hooked it up.

Now, the DL worked just fine & it downloaded for 1/2 hour only to tell me in the end that I needed more space on my C drive (I have 2.5 gigs free) to install the update.

Since it's not really possible to install a bigger C drive (It's soldered to the motherboard & the screen is glued on) I guess I will be seeing that nag screen fro a while longer (I LOVE the Surface & have no plans to replace it)

~John