Unassigned Devices - Managing Disk Drives and Remote Shares Outside of The Unraid Array
Unassigned Devices Plugin
Unassigned Devices (UD) includes a lot of functionality and has become a bit complex. Please read the first and second post. You will find answers to most of your questions.
Note: You will need to install the Unassigned Devices Plus (UD+) plugin to enable HFS+ and APFS (Apple file formats) and exFAT (flash larger than 64MB) disk mounting, and to enable 'Destructive Mode' for formatting of some UD supported disk formats.
UD and
Your disk has a problem:
Aug 7 09:36:05 Tower unassigned.devices: Formatting disk '/dev/sdf' with 'xfs' filesystem.
Aug 7 09:36:06 Tower kernel: sd 5:0:0:0: [sdf] tag#0 UNKNOWN(0x2003) Result: hostbyte=0x07 driverbyte=0x00 cmd_age=0s
Aug 7 09:36:06 Tower kernel: sd 5:0:0:0: [sdf] tag#0 CDB: opcode=0x2a 2a 00 3a 38 5a f0 00 00 f0 00
Aug 7 09:36:06 Tower kernel: print_req_error: 2 callbacks suppressed
Aug 7 09:36:06 Tower kernel: blk_update_request: I/O error, dev sdf, sector 976771824 op