OK what about this.
root@nas:~# blkid
/dev/sda1: LABEL="External USB" BLOCK_SIZE="512" UUID="01D28AE67523FE50" TYPE="ntfs" PARTLABEL="Basic data partition" PARTUUID="740c9ae0-8ae6-01d2-704d-063a7345e900"
/dev/sdb1: LABEL_FATBOOT="UNRAID" LABEL="UNRAID" UUID="2732-64F5" BLOCK_SIZE="512" TYPE="vfat"
/dev/loop1: TYPE="squashfs"
/dev/sdf1: UUID="17b664ed-15cd-4bf2-b575-7fe0cde7d481" UUID_SUB="cf5b2483-201e-4c02-981e-f2aa0a086ea9" BLOCK_SIZE="4096" TYPE="btrfs"
/dev/sdd1: UUID="0388e9a3-f50c-4509-92c2-e54bbd6f66d1" UUID_SUB="164520f4-46ba-4f65-ada2-8ca0a902a394" BLOCK_SIZE="4096" TYPE="btrfs"
/dev/md2: UUID="3cc4eee7-88e3-4d68-bfdd-d475bcc4c84f" BLOCK_SIZE="512" TYPE="xfs"
/dev/sdi1: UUID="0b50b5bb-a16d-4ec7-a34f-84f3b1c8965e" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="bac94e19-3760-449c-8417-ca4a955c7adc"
/dev/sdg1: UUID="12e9017d-c270-4e56-a128-b8a56439a339" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="3c0e6c61-9c10-4809-8dd2-35f0ae79cfe2"
/dev/loop0: TYPE="squashfs"
/dev/sde1: UUID="17b664ed-15cd-4bf2-b575-7fe0cde7d481" UUID_SUB="04839745-fc3f-4820-b5ea-8aef210826a9" BLOCK_SIZE="4096" TYPE="btrfs"
/dev/sdc1: UUID="0388e9a3-f50c-4509-92c2-e54bbd6f66d1" UUID_SUB="a9a92d89-34e4-410a-9b7c-6bb74fb3c80a" BLOCK_SIZE="4096" TYPE="btrfs"
/dev/md3: UUID="257d5a21-ebfe-4df9-bdba-e8236935fd28" BLOCK_SIZE="512" TYPE="xfs"
/dev/sdj1: UUID="257d5a21-ebfe-4df9-bdba-e8236935fd28" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="ce956125-26cc-4a3b-928a-082254ac8aa8"
/dev/md1: UUID="0b50b5bb-a16d-4ec7-a34f-84f3b1c8965e" BLOCK_SIZE="512" TYPE="xfs"
/dev/sdh1: UUID="3cc4eee7-88e3-4d68-bfdd-d475bcc4c84f" BLOCK_SIZE="512" TYPE="xfs" PARTUUID="845c5dee-579a-4721-8486-248b779d456c"
/dev/loop2: UUID="9189f30b-12c6-4510-a976-0b71758dd971" UUID_SUB="877baabc-8c26-4193-bdb6-b98755e78d8b" BLOCK_SIZE="4096" TYPE="btrfs"
/dev/loop3: UUID="407b681c-1695-406e-a8b8-6d046b8a3b38" UUID_SUB="2236014a-bd7a-403c-8ca3-bfcf69eb7d4d" BLOCK_SIZE="4096" TYPE="btrfs"
sda1 is a 4tb NTFS USB hard drive mounted by unassigned devices
sdb1 is the USB flash boot.
Why is it choking on sda1 when it is clean anyway and still not booting sdb1