Just to let you know, 94GB is perfectly normal, its just how the addressing scheme works.
If you are curious read below.
The missing HDD space is a simple case of the HDD manufacturer and OS differing in their definitions of memory. The OS has always defined memory units in terms of base "2" numbering due to the binary nature of addressing (1024 bytes in KB, 1024 KB in MB, 1024 MB in GB). This yields 1.074*10^9 bytes per GB. However, someone in the HDD business years ago decided that if they redefined the GB as 1*10^9 (a billion bytes) they could market the same HD disks as larger capacities (and get more $$) than what the OS would recognize. This definition is always stated on the box in extremely small print to legally cover themselves. By this relationship your OS actually has about 93% of what is listed on the box, that is why you only see 298GB instead of 320GB. This linear relationship is the reason why as HDD capacities increase, the number of GB's missing also increases.
The exact same thing happens with your 120GB HDD, its showing 94GB because of the scheme. If you want more proof, take a look at your PC, you would have something like a 320GB HDD or 500GB or something, but its not really 320GB or 500GB. Just right click on a HDD and go to properties, then look at the number of bytes (total), and look beside that.
I hope that explains why you are only seeing 94GB.
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