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does each external harddrive have unique ID

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i have bought 3 external transcend hard drive. i use one and gave other 2 to my brothers. the colors are same so how can i identify my own drive. does it have unique ID so that i can recoginize mine despite there are many things to recognise mine like marking it. but i wanted to know if every hardrive has unique ID like computer or not? if yes then how to know that?
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Neil Jones

Neil Jones

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Every hard drive has a distinctive Volume Serial Number, with the chances of any two drives you encounter having the same serial number astronomically high. For this reason, the Volume Serial Number is often used as part of copy protection schemes. One caution is that operating system re-installations and upgrades may change a Volume Serial Number, and formatting certainly will.
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