Bit             

Value of 0 or 1

Nibble

4 bits

Byte

8 bits

KB      (Kilobit) 

1,024 bytes

MB     (Megabyte) 

1,024 Kilobytes or 1,048,576 Bytes

GB      (Gigabyte)   

1,024 Megabytes or 1,073,741, 824 Bytes

TB      (Terabyte)     

1,024 Gigabyte or 1,099,511,627,776 bytes

PB      (Petabyte)       

1,000,000,000,000,000 bytes

EB      (Exabyte)      

1,000,000,000,000,000,000 bytes

ZB      (Zetabyte)  

1,000,000,000,000,000,000,000 bytes

YB      (Yottabyte)

1,000,000,000,000,000,000,000,000 bytes