I recently attempted to install a fresh CentOS use an old HDD, I got an error message

Warning: Disk sda contains BIOS RAID metadata, but is not part of any recognized BIOS RAID sets. Ignoring disk sda

To fix this so the installation lets us use the disks, we need to boot to some kind of linux console

Step 1. Booting into Rescue Mode: To boot into rescue mode, you must be able to boot the system using the CentOS installation CD-ROM. Choose Rescue Mode on Menu options or type the following command at the installation boot prompt:
linux rescue

Step 2. Erasing BIOS metadata, you can choose one of 2 solutions bellow

1. Using dmraid command to erase BIOS metadata on disk

# dmraid -r -E /dev/sda
Do you really want to erase "pdc" ondisk metadata on /dev/sda ? [y/n] : y

2. Using dd command

# dd if=/dev/zero of=/dev/sda bs=512 seek=$(( $(blockdev --getsz /dev/sda) - 1024 )) count=1024

Replace sda with the disks on your computer (can be sdX or hdX, with X being any letter, depending on the port they are connected to and the order)

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