What does it mean that a partition has hash marks on it for Windows 10?

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    It is simply a design decision, isn't it? – xdevs23 May 5 '17 at 5:13
  • Hatch marks???? – Linker3000 May 5 '17 at 6:21

That simply indicates the partition that currently has attention. If you use your mouse to click on the C: partition, it will have those same marks. Then, you can potentially right-click and choose another function, like viewing Properties.

Disk Management

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What does it mean when a partition has hash marks on it in Windows?

It indicates that the partition has been selected (also indicated shown by the blue rectangle in the top part of the dialog where a selection is made.).

Here is an example showing the default selection after opening Disk Management:

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After selecting "Expansion (F:)":

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You can see the diagonal lines have moved.

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  • This has been the case since the original version of Windows NT, version 3.1, so you probably shouldn't imply that your answer is limited to Windows 10. :-) – Cody Gray Dec 18 '16 at 19:14
  • @CodyGray Answer updated :) – DavidPostill Dec 18 '16 at 19:29

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