$ fdisk -l | grep "sd[c,d]"
Disk /dev/sdc: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
/dev/sdc1   2048 3907029134 3907027087  1.8T Linux RAID
Disk /dev/sdd: 1.8 TiB, 2000398934016 bytes, 3907029168 sectors
/dev/sdd1   2048 3907029134 3907027087  1.8T Linux RAID