✔ 最佳答案
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Have to format?
If your hard disk drive D have not used before, you need to format it if you want to open it. Usually the upformated disk's space is 0%, Windows does not let you to use it if it is unformated.
If your computer have virus, and you reinstalled Windows, that the hard disk drive D was "closed", if you want to open it, you have to format it first. Or if you cut the space of the disk, made a new disk space in different drive letter, you need to format it first too, or you cannot use it.