1G=1024MB
存储单元别离有B;KB;MB;GB;TB;PB;EB;ZB;YB
换算关系如下：
1Byte = 8 Bit
1 KB = 1,024 Bytes
1 MB = 1,024 KB
1 GB = 1,024 MB
1 TB = 1,024 GB
1 PB = 1,024 TB
1 EB = 1,024 PB
1 ZB = 1,024 EB
1 YB = 1,024 ZB
1TB=1024GB
1GB=1024MB
1MB=1024KB
1kb=1024byte
1byte=8bit
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