Un bit este unitatea indivizibila pentru cantitatea de informatie. Un bit poate lua valorile 0 sau 1.
Un sir de 8 biti formeaza un byte.
Cand descriem marimea memoriei sau a datelor stocate, bitii / bytes sunt in general calculati ca exponenti de 2. Astefel:
1 bit (b)
1 byte (B) = 8 bits
1 Kilobyte (KB) = 2^10 bytes = 1,024 bytes
1 Megabyte (MB) = 2^20 bytes = 1,048,576 bytes
1 Gigabyte (GB) = 2^30 bytes = 1,073,741,824 bytes
1 Terabyte (TB) = 2^40 bytes = 1,099,511,627,776 bytes
1 Petabyte (PB) = 2^50 bytes = 1,125,899,906,842,624 bytes
1 Exabyte (EB) = 2^60 bytes = 1,152,921,504,606.846,976 bytes
1 Zettabyte (ZB) = 2^70 bytes = 1,180,591,620,717,411,303,424 bytes
1 Yottabyte (YB) = 2^80 bytes = 1,208,925,819,614,629,174,706,176 bytes
