cannot zpool remove a top level vdev

I have a Pool call Tank1 with 2 vdev, each vdev contains one 4TB HDD, I would like to make them independent pool so that the pool will not failed once any of HDD dead.

I ran the

zpool remove -pw Tank1 gptid/50da9f7f-ee04-11ea-a346-109027e866a1

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and I got this

cannot remove gptid/50da9f7f-ee04-11ea-a346-109027e866a1: invalid config; all top-level vdevs must have the same sector size and not be raidz.

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I ran below command and notice one of my Sector Sizes: 512 bytes...

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