Mounting a removed internal disk via USB

[Manfred73]

I'm facing a similar issue: I had a single storage pool with one shared folder on it, but the filesystem type is zfs and is located on /dev/sdb3.
I have zfs and zpool tools installed in Ubuntu and attached the drive through usb.

How can I mount this zfs partition?

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mount -t ext4 /dev/sdb3 /media/x-qnap

gives an error because it is not ext4:
mount: /media/x-qnap: wrong fs type, bad option, bad superblock on /dev/sdb3, missing codepage or helper program, or other error.
dmesg(1) may have more information after failed mount system call.

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mdadm --assemble --scan

says: No arrays found in config file or automatically

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mount -t zfs /dev/sdb3 /media/x-qnap

gives error:
filesystem 'zpool7' cannot be mounted, unable to open the dataset

So how can I mount this partition and what is the dataset?

[dolbyman]

old tipic closed for necroposting and split for wrong FS (ZFS vs ext4/mdadm)