Hdd format sizes?

400Gb=400x10^9 / 1024^3 = 372.5Gb shown in windows

500Gb=465.6Gb in Windows

In both cases you'll need to deduct another 7-10Mb for file system overheads.
 
if you don't understand what's written above..

400 divide by 1024, divide by 1024, divide by 1024, times 1000,000,000 (nine zero's)
 
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