80G laptop hard drive problem

Users questions: 80g, then what would actually use g ah? I used the optimized master display is 74.53g, is this normal? There is no way to extra few g
Experts answer: normal. Hard drive manufacturers and distributors are calculated using decimal hard drive capacity, that is: 1000M = 1G, but this calculation used to Has been accepted by all. But the system, but honest manner calculated by 1024M = 1G, so the nominal capacity of the hard disk is always smaller than the actual available capacity, and the nominal capacity of the larger, the greater this difference. So, you encounter the situation is normal, do not expect go to increasing the number of G.
  • This information provided by the users.Thanks!