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Search by Google and you'll find that many people have the same issue: Extend Volume is disabled for C drive after shrinking D. However, both functions have limitations when repartition hard drive.
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So Microsoft added Shrink Volume and Extend Volume functions in Disk Management to help resize partition without losing data. Nobody likes to recreate disk partitions, reinstall Windows and all programs. C drive full and low disk space is most common issue on Windows 7 computer, no matter you use laptop or desktop, use SSD or traditional mechanical hard disk for operating system.
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