hi, the specs on my computer is that it has 320GB of HDD.but that does not seem to be the case because i can only see 287GB.i am running windows 7 starter and the computer model is Acer Aspire 5734z christine.
More aboutacer 5734z specs
Due to formating the drive it will by default have less than 320GB of space. You loose about 6% - 7%. Also it might have a recovery partition which contains the OS, drivers, and other programs.