I was listening to the latest Dot Net Rocks! show on Windows Server where they talked about 64-bit Windows and addressable memory was discussed.

It was said that 32-bit Windows can address 4 GB of memory. Now that's 2^32/1024/1024/1024 = 4.

But they said that 64-bit Windows can address 16 TB (Terabytes). However, when I do the same calculation as above I get this:

2^64/(1024^6)=16. That's not Terabytes, that's Exabytes!

The sequence is Byte, Kilobyte, Megabyte, Gigabyte, Terabyte, Petabyte, Exabyte, Zettabyte.

Now, what's right? The quoted Terabytes or the calculated Exabytes?