I have 4 1TB drives, one acting as a parity drive for my FlexRAID array. All are almost full, only one has 70GB with the rest with less than 10GB left.

Then I have 2 250GB drives. One for dual boot OS (Windows 7 32-bit and 64-bit) and it is about 50% full. Then a 750GB drive for Misc. storage that has 100GB free.

I'm going to need to buy another 1TB soon.