Editing Binary prefix (section)

==== Optical disks ====
When specifying the capacities of optical [[compact disc]]s, "megabyte" and "MB" usually meant 1024<sup>2</sup>&nbsp;bytes. Thus a "700-MB" (or "80-minute") CD has a nominal capacity of about {{val|700|u=MiB}}, which is approximately {{val|730|u=MB}} (decimal).<ref name="cdromcap" />

On the other hand, capacities of other [[optical disc]] storage media like [[DVD]], [[Blu-ray Disc]], [[HD DVD]] and [[Magneto-optical drive|magneto-optical (MO)]] have been generally specified in decimal gigabytes ("GB"), that is, 1000<sup>3</sup> bytes. In particular, a typical "{{val|4.7|u=GB}}" DVD has a nominal capacity of about {{val|4.7|e=9|u=bytes}}, which is about {{val|4.38|u=GiB}}.<ref name="dvdcap" />