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It probably has another partition on it, Maybe a copy of Windows 10 so that it can be reinstalled. You will need a hard drive utility to look at the drive in detail but you can start with the Hardware Manager program built into Windows to look at it to start with. I haven't got a Windows machine here at the moment so can't give more exact detail.
Like someone said drives are reasonably cheap, one way of speeding the machine up might be to invest in a SSD (Solid State Drive).
Regards
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