This worked yesterday. I have an external USB 3.0 drive I am trying to use to backup data. It was connected yesterday, and did backup some files. I was using rsync to copy from the data drive to this USB drive. I was getting i/o erros, so was trying the cp command to try and copy the files. All of a sudden the drive unmounts itself and now I am getting errors trying to mount it.
Aug 3 09:17:45 openmediavault kernel: [82062.157366] EXT4-fs warning (device sdu1): ext4_end_bio:250: I/O error -5 writing to inode 21757975 (offset 1492402176 size 126976 starting block 1091681)
Aug 3 09:17:45 openmediavault kernel: [82062.157431] EXT4-fs warning (device sdu1): ext4_end_bio:250: I/O error -5 writing to inode 21757975 (offset 1492525056 size 126976 starting block 1091711)
Aug 3 09:17:45 openmediavault kernel: [82062.157498] EXT4-fs warning (device sdu1): ext4_end_bio:250: I/O error -5 writing to inode 21757975 (offset 1492647936 size 126976 starting block 1091741)
Aug 3 09:17:45 openmediavault kernel: [82062.157562] EXT4-fs warning (device sdu1): ext4_end_bio:250: I/O error -5 writing to inode 21757975 (offset 1492770816 size 126976 starting block 1091771)
Aug 3 09:17:45 openmediavault kernel: [82062.157655] EXT4-fs warning (device sdu1): ext4_end_bio:250: I/O error -5 writing to inode 21757975 (offset 1492893696 size 126976 starting block 1091801)
Aug 3 09:17:45 openmediavault kernel: [82062.157724] EXT4-fs warning (device sdu1): ext4_end_bio:250: I/O error -5 writing to inode 21757975 (offset 1493016576 size 126976 starting block 1091831)
Aug 3 09:17:45 openmediavault kernel: [82062.157746] EXT4-fs warning (device sdu1): ext4_end_bio:250: I/O error -5 writing to inode 21757975 (offset 1493139456 size 32768 starting block 1091839)
Aug 3 09:17:45 openmediavault kernel: [82062.449509] JBD2: Detected IO errors while flushing file data on sdu1-8
Aug 3 09:17:46 openmediavault kernel: [82062.801790] xhci_hcd 0000:04:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff88081262f8c0
Aug 3 09:17:46 openmediavault kernel: [82062.801795] xhci_hcd 0000:04:00.0: xHCI xhci_drop_endpoint called with disabled ep ffff88081262f900