The best you could hope for by taking this to Trading Standards (or the equivalent depending on which country you live in) would be them forcing the manufacturers to specify that they had used a decimal rather than binary equation to calculate the capacity of the disk. But anybody who knows the difference will already know that hard disks are never formatted to the advertised capacity, and people who don't know the difference will still expect a 160GB drive, even if the packaging says "160GB (decimal)".
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moto
