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No, TB2. The guideline says ""Editors should use the conventional prefixes, such as kilobyte (KB) and megabyte (MB), and disambiguate where necessary."" (i.e. it is not mandatory to disambiguate) and ""IEC prefixes are not to be used on Wikipedia except under the following circumstances"". Looking at Warren's changes, where you say he has done nothing wrong (on MOSNUM), he has correctly removed the IEC prefixes, within the scope of the guideline. He obviously doesn't think disambiguation is necessary which is also within the scope of the guideline and you did say he has done nothing wrong. Obviously from your comments you do think disambiguation is necessary, so within the scope of the guideline you should be adding acceptable disambiguation, not adding IEC prefixes back again. aton "