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比特(bit)是最小的存儲單位。計算機存儲單位一般用字節(Byte)、千字節(KB)、兆字節(MB)、吉字節(GB，又稱京字節)、太字節(TB，又稱垓字節)、拍字節(PB)、艾字節(EB)、澤字節(ZB，又稱皆字節)、堯字節(YB，又稱佑字節)表示。

數據單位，1 PB = 1024 TB = 1048576 GB 。

最小的基本單位是bit（比特），按大小順序所有單位分別是：bit、B、KB、MB、GB、TB、PB、EB、ZB、YB、BB、NB、DB、CB、XB ，按照進率1024（2^10）計算。

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