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I tried formatting 6 times with different types of connections: 2 AC adapters x 2 drive bays with XFS, + 1 time with SATA, + 1 time with ext4. SMR is known to be bad for long writes since it duplicates work internally. It is known to be faulty for XFS I found out, so I tried ext4. Even then, formatting failed after over an hour. Something like this happens every time: #mkfs.xfs: mkfs.xfs: libxfs_device_zero write failed: Input/output error #mkfs.ext4: Allocating group tables: done Writing inode tables: done Creating journal (262144 blocks): done Writing superblocks and filesystem accounting information: mkfs.ext4: Input/output error while writing out and closing file system It is just past the return window, so I'm screwed.