# fdisk -l /dev/sd?                                                                                                             
Disk /dev/sda: 7,3 TiB, 8001563222016 bytes, 15628053168 sectors
Disk model: WDC WD80EFAX-68K
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt

Device         Start         End     Sectors  Size Type
/dev/sda1       2048       22527       20480   10M BIOS boot
/dev/sda2      22528      999423      976896  477M Linux RAID
/dev/sda3     999424   118185983   117186560 55,9G Linux RAID
/dev/sda4  118185984 15628053134 15509867151  7,2T Linux RAID


Disk /dev/sdb: 9,1 TiB, 10000831348736 bytes, 19532873728 sectors
Disk model: MG06ACA10TE
Units: sectors of 1 * 512 = 512 bytes
Sector size (logical/physical): 512 bytes / 4096 bytes
I/O size (minimum/optimal): 4096 bytes / 4096 bytes
Disklabel type: gpt

Device         Start         End     Sectors  Size Type
/dev/sdb1       2048       22527       20480   10M BIOS boot
/dev/sdb2      22528      999423      976896  477M Linux RAID
/dev/sdb3     999424   118185983   117186560 55,9G Linux RAID
/dev/sdb4  118185984 15628053134 15509867151  7,2T Linux RAID