From what I understand you can only have 4 partitions on a single disk. That's fine but how would I add the unallocated space to one of the other drives?

I have heard you can use 3rd party tools but I would really prefer to do this natively using Windows tools. Is it possible?

When I right click the unallocated space everything is greyed out:

enter image description here

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    You can't it's an extended partition. You would have to delete it then create it again. You should switch to GPT allows you more then 4 partitions – Ramhound Jul 27 '16 at 18:27
  • Can I switch to GPT if I am already using MBR without starting from scratch? – throwayusername Jul 27 '16 at 18:32
  • @throwayusername If you care about your data and don't have a backup you are confident you could restore from, you have bigger problems than unallocated space. – David Schwartz Jul 27 '16 at 18:48
  • @DavidSchwartz fair! – throwayusername Jul 27 '16 at 19:33

Windows partitioning tools (currently?) don't support resizing extended partitions (identified by the green box around your logical partition "H:").

To extend an extended partition (without destroying data in the logical partitions within it) you'll need to use a 3rd party partitioning utility, like (for example) a GPartEd Live CD/USB.

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