1Byte = 8 Bit

1 KB = 1,024 Bytes

1 MB = 1,024 KB = 1,048,576 Bytes

1 GB = 1,024 MB = 1,048,576 KB = 1,073,741,824 Bytes

1 TB = 1,024 GB = 1,048,576 MB = 1,073,741,824 KB = 1,099,511,627,776 Bytes

1 PB = 1,024 TB = 1,048,576 GB = ... = 1,125,899,906,842,624 Bytes

1 EB = 1,024 PB = 1,048,576 TB = ... = 1,152,921,504,606,846,976 Bytes

1 ZB = 1,024 EB = ... = 1,180,591,620,717,411,303,424 Bytes

1 YB = 1,024 ZB = ... = 1,208,925,819,614,629,174,706,176 Bytes

目前 YB是計算機界已知最大的儲存空間單位. 以一個250GB的硬碟而言, 1YB就需要約4兆5千億個這樣的硬碟. 再大的單位恐怕在短期間內是還用不到的.