How much of the hard drive does windows see? If windows see's roughly 465GB then everything is fine... Its a real 'shaft' but hard drive manufacturers measure the storage in 1000's of bytes instead of 1024's of bytes and have done so as long as i remember.
An easy way to tell the *real* capacity of a hard drive is to divide it by 1.024 three times, for example:
500 / 1.024 / 1.024 / 1.024 = 465.66
and for quick reference, here is the real capacity of other sizes of hard drive
10 GB = 9.31 GB
20 GB = 18.63 GB
30 GB = 27.94 GB
36 GB = 33.53 GB
40 GB = 37.25 GB
60 GB = 55.88 GB
74 GB = 68.91 GB
80 GB = 74.51 GB
100 GB = 93.13 GB
120 GB = 111.76 GB
160 GB = 149.01 GB
180 GB = 167.64 GB
200 GB = 186.26 GB
250 GB = 232.83 GB
300 GB = 279.40 GB
320 GB = 298.02 GB
400 GB = 390.62 GB
500 GB = 465.66 GB
750 GB = 698.49 GB
1000 GB / 1 TB = 931.32 GB




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