碟廠商十進位計算: 4TGB=4000,000MB=4000,000,000KB=4000,000,000,000Byte 作業系統實際二進位計算: 4000GB=4096,000MB=4194304000KB=4294,967,296000Byte 1GB的實際字節（Byte）計算： 1GB=1024MB*1024KB*1024Byte=1,073,741,824Byte 那麼4TB實際容量： 4000,000,000,000Byte/（1024MB*1024KB*1024Byte）=3725.29GB=3.72TB 所以，4TB的硬碟容量，我們實際上只能算上3.7TB 這就是實際購買跟監控不同的原因
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