Ok, seeing as you’re clearly booting from /dev/sdb I’ll assume the other drive /dev/sda is empty and unformatted. Please make sure this is the case otherwise you’re going to blow your install or lose data by doing what follows below:
first partition it using gdisk - if you’re running Linux without a GUI (as you should be if you’ve followed the install instructions) you cannot use gparted.
so basically from the terminal run:
gdisk /dev/sdaonce in hit x for extra functionality and then z to zap the drive. Follow the prompts answering Y for all. gdisk will quit and return you to the command line. Hit the up arrow on the keyboard which will reinsert
gdisk /dev/sda in the terminal window and press enter to run gdisk again. This time press n for new partition table and follow the prompts - you can pretty much press enter and accept each default as presented. When it’s done you’ll be back at the gdisk main menu. Enter W to write changes and quit gdisk. When back at the command line type the following:
mkfs.ext4 /dev/sda1[/code]The drive will be formatted and you'll be returned to the command prompt. Finally type the following to maximise available storage capacity to store data:[code]tune2fs -m 0 /dev/sda1That’s it.