I added them to the array, and then format them from the Unraid WebUI, and it formats them, but they remain unmountable. I only tried to format them via terminal as a test, because they're brand new, I was curious if they could be formatted without error. I included the diagnostics and pasted the disk log information that seems to be showing it formatting them in GPT. In the WebUI it shows the filesystem as "auto"
Nov 5 16:33:16 mediaserver kernel: ata1: SATA max UDMA/133 abar m1024@0xffb6e000 port 0xffb6e100 irq 41
Nov 5 16:33:16 mediaserver kernel: ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
Nov 5 16:33:16 mediaserver kernel: ata1.00: ATA-10: ST4000DM004-2CV104, 0001, max UDMA/133
Nov 5 16:33:16 mediaserver kernel: ata1.00: 7814037168 sectors, multi 16: LBA48 NCQ (depth 32), AA
Nov 5 16:33:16 mediaserver kernel: ata1.00: configured for UDMA/133
Nov 5 16:33:16 mediaserver kernel: sd 1:0:0:0: [sdb] 7814037168 512-byte logical blocks: (4.00 TB/3.64 TiB)
Nov 5 16:33:16 mediaserver kernel: sd 1:0:0:0: [sdb] 4096-byte physical blocks
Nov 5 16:33:16 mediaserver kernel: sd 1:0:0:0: [sdb] Write Protect is off
Nov 5 16:33:16 mediaserver kernel: sd 1:0:0:0: [sdb] Mode Sense: 00 3a 00 00
Nov 5 16:33:16 mediaserver kernel: sd 1:0:0:0: [sdb] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Nov 5 16:33:16 mediaserver kernel: sd 1:0:0:0: [sdb] Preferred minimum I/O size 4096 bytes
Nov 5 16:33:16 mediaserver kernel: sd 1:0:0:0: [sdb] Attached SCSI disk
Nov 5 16:33:32 mediaserver emhttpd: ST4000DM004-2CV104_ZTT4GJQ8 (sdb) 512 7814037168
Nov 5 16:33:32 mediaserver kernel: mdcmd (2): import 1 sdb 64 3907018532 0 ST4000DM004-2CV104_ZTT4GJQ8
Nov 5 16:33:32 mediaserver kernel: md: import disk1: (sdb) ST4000DM004-2CV104_ZTT4GJQ8 size: 3907018532
Nov 5 16:33:33 mediaserver emhttpd: read SMART /dev/sdb
Nov 5 16:48:41 mediaserver emhttpd: writing GPT on disk (sdb), with partition 1 byte offset 32KiB, erased: 0
Nov 5 16:48:41 mediaserver emhttpd: shcmd (944): sgdisk -Z /dev/sdb
Nov 5 16:48:41 mediaserver emhttpd: shcmd (945): sgdisk -o -a 8 -n 1:32K:0 /dev/sdb
Nov 5 16:49:20 mediaserver emhttpd: read SMART /dev/sdb
Nov 5 16:49:37 mediaserver emhttpd: writing GPT on disk (sdb), with partition 1 byte offset 32KiB, erased: 0
Nov 5 16:49:37 mediaserver emhttpd: shcmd (1052): sgdisk -Z /dev/sdb
Nov 5 16:49:37 mediaserver emhttpd: shcmd (1053): sgdisk -o -a 8 -n 1:32K:0 /dev/sdb
Nov 5 16:33:16 mediaserver kernel: ata2: SATA max UDMA/133 abar m1024@0xffb6e000 port 0xffb6e180 irq 41
Nov 5 16:33:16 mediaserver kernel: ata2: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
Nov 5 16:33:16 mediaserver kernel: ata2.00: ATA-10: ST4000DM004-2CV104, 0001, max UDMA/133
Nov 5 16:33:16 mediaserver kernel: ata2.00: 7814037168 sectors, multi 16: LBA48 NCQ (depth 32), AA
Nov 5 16:33:16 mediaserver kernel: ata2.00: configured for UDMA/133
Nov 5 16:33:16 mediaserver kernel: sd 2:0:0:0: [sdc] 7814037168 512-byte logical blocks: (4.00 TB/3.64 TiB)
Nov 5 16:33:16 mediaserver kernel: sd 2:0:0:0: [sdc] 4096-byte physical blocks
Nov 5 16:33:16 mediaserver kernel: sd 2:0:0:0: [sdc] Write Protect is off
Nov 5 16:33:16 mediaserver kernel: sd 2:0:0:0: [sdc] Mode Sense: 00 3a 00 00
Nov 5 16:33:16 mediaserver kernel: sd 2:0:0:0: [sdc] Write cache: enabled, read cache: enabled, doesn't support DPO or FUA
Nov 5 16:33:16 mediaserver kernel: sd 2:0:0:0: [sdc] Preferred minimum I/O size 4096 bytes
Nov 5 16:33:16 mediaserver kernel: sd 2:0:0:0: [sdc] Attached SCSI disk
Nov 5 16:33:32 mediaserver emhttpd: ST4000DM004-2CV104_ZTT4MASZ (sdc) 512 7814037168
Nov 5 16:33:32 mediaserver kernel: mdcmd (3): import 2 sdc 64 3907018532 0 ST4000DM004-2CV104_ZTT4MASZ
Nov 5 16:33:32 mediaserver kernel: md: import disk2: (sdc) ST4000DM004-2CV104_ZTT4MASZ size: 3907018532
Nov 5 16:33:33 mediaserver emhttpd: read SMART /dev/sdc
Nov 5 16:48:41 mediaserver emhttpd: writing GPT on disk (sdc), with partition 1 byte offset 32KiB, erased: 0
Nov 5 16:48:41 mediaserver emhttpd: shcmd (950): sgdisk -Z /dev/sdc
Nov 5 16:48:41 mediaserver emhttpd: shcmd (951): sgdisk -o -a 8 -n 1:32K:0 /dev/sdc
Nov 5 16:49:20 mediaserver emhttpd: read SMART /dev/sdc
Nov 5 16:49:37 mediaserver emhttpd: writing GPT on disk (sdc), with partition 1 byte offset 32KiB, erased: 0
Nov 5 16:49:37 mediaserver emhttpd: shcmd (1058): sgdisk -Z /dev/sdc
Nov 5 16:49:37 mediaserver emhttpd: shcmd (1059): sgdisk -o -a 8 -n 1:32K:0 /dev/sdc
mediaserver-diagnostics-20221105-1625.zip