rails/rails — pull request #7829 by jarl-dk (2012-10-03 09:31:13+00:00)
Title: Using the right notation for the right exponent base.

When base is 1024 the notation should be IEC prefixes (KiB, MiB, GiB, etc.)
When base is 1000 the notation should be SI prefixes (KB, MB, GB, etc.)

See
http://en.wikipedia.org/wiki/Mebi-#IEC_standard_prefixes
http://en.wikipedia.org/wiki/Binary_prefix