1 Byte = 8 bit 在UTF-8编码中,一个中文等于三个字节
1 kB = 1024 B
1 MB = 1024 kB
1 GB = 1024 MB
1 TB = 1024 GB
1 PB = 1024 TB
1 EB = 1024 PB
1 ZB = 1024 EB
1 YB = 1024 ZB