bit (binari digit 0,1 )
8 bits 1 byte
2^10 bytes = 1024 bytes = 1 kB
2^10 kB = 1024 = 1 mb
2^10 MB = 1024 GB
2^10 GB = 1024 TB
2^10 TB= 1024 PB
20 MB = 4.7 GB DVD T = 30 Min. t=4.7 x 1024 x 8 mb : 20 m/s= 32 Min con 5 seg
