orthography - Space before computer storage abbreviations



Forgive me if this has already been asked, I could not find it via search.


My question is this: what is the proper way to append computer storage abbreviations to a number? For example, a 500 gigabyte hard disk drive will usually be spelled as "500GB" on web sites, with no space, but occasionally I see "500 GB", with a space between the number and the unit. Putting a space between the number and the abbreviation makes more sense to me, but since even Apple does not put a space between them, I am not sure. Which is the proper way?




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