While storage devices usually have their size expressed in powers of 10 (for instance a 1 TB Solid State Drive will contain at least 1,000,000,000,000 (1012, 10004) bytes), filesystem limits are invariably powers of 2, so usually expressed with IEC prefixes.
Storage devices typically express their capacity in multiples of 10 (such as a 1 TB Solid State Drive containing at least 1,000,000,000,000 bytes), whereas filesystem limits are always expressed as powers of 2 using IEC prefixes.