Please look at the following screenshots.

  1. Is /dev/sda1 useful at all (Windows says it is a Recovery Partition)? Can I remove it? It is only 1000MB and removing it seems no use, so the best I can do is just leave it?

  2. /dev/sda5 and /dev/sda6 are Recovery partition and OEM partition, and they occupy 14.4GB + 7GB in total, can I delete them? How shall I modify the boot so that deleting them won't mess up the boot (in /dev/sda2)?

  3. Is it possible to move linux backward (to the current /dev/sda5 and /dev/sda6) without affecting Linux data (and may be a little larger than current space)? What I wanted to do is to increase Windows 10 partition a bit by moving Linux backward.

The pictures are attached below.


Partition View Under Linux

Partition View Under Windows


Before you do anything, I suggest making an image of the entire disk. That way you can recover if anything goes wrong. Also, do it in steps. That is, just do one step at a time, and boot both OS's in between steps so you can be sure nothing is broken.

sda5 and sda6 should be OK to remove. I don't think you will need to make any modifications to the boot configurations. After that, you can move sda7 and sda8 to the right. That will take a significant amount of time, because it has to physically move all of the data. Once that's done, extending sda4 should be a breeze.

I'm not well-versed in EFI, but I'm thinking you need to keep sda1. I don't think Windows will be able to boot without it. Even if I'm wrong about that, I don't think it's really worth the effort to try and recover that space.

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