64 GB
64 × 1000^3(= 1,000,000,000 bytes per GB)
64,000,000,000
bytes
64 GiB
64 × 2^30(= 1,073,741,824 bytes per GiB)
68,719,476,736
Same letter level — different bytes
64 GB ≠ 64 GiB. Gap: 4,719,476,736 bytes. Internal memory (RAM) should use IEC.
