# fdisk -l /dev/sda Disk /dev/sda: 101.8 GB, 101860769792 bytes 255 heads, 63 sectors/track, 12383 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System /dev/sda1 * 1 13 104391 83 Linux /dev/sda2 14 12383 99362025 8e Linux LVM # parted /dev/sda print Disk geometry for /dev/sda: 0.000-97142.000 megabytes Disk label type: msdos Minor Start End Type Filesystem Flags 1 0.031 101.975 primary ext3 boot 2 101.975 97135.202 primary lvm Information: Don't forget to update /etc/fstab, if necessary. From the output of parted you can see that the system drive has a msdos disk label -- that's good for the system drive, but NOT what you want for your data drive. Your data drive should look somewhat like this -- all empty: # parted /dev/sdb print Disk geometry for /dev/sdb: 0.000-4194614.000 megabytes Disk label type: none Minor Start End Filesystem Name Flags Please note that "parted" uses Megabytes for the partition boundaries, and not cylinders. run parted interactively on your new, and empty data drive, e.g. /dev/sdb, and create a GPT Disk Label, then specify one partition using the size of your drive in Megabytes from the "disk geometry" listing: # parted (parted) mklabel gpt (parted) print Disk geometry for /dev/sdb: 0.000-4194614.000 megabytes Disk label type: gpt Minor Start End Filesystem Name Flags (parted) mkpart primary ext3 0 4194614 (parted) print Disk geometry for /dev/sdb: 0.000-4194614.000 megabytes Disk label type: gpt Minor Start End Filesystem Name Flags 1 1.000 4194613.983 ext3 Information: Don't forget to update /etc/fstab, if necessary. (parted) quit # create your filesystem on /dev/sdb1 If you are using an ext3 file system, I recommend to use the option -m0 to not reserve the standard 5% space for root -- no reason to waste that space. # mkfs.ext3 -m0 /dev/sdb1 # mkdir /data # mount -t ext3 /dev/sdb1 /data # df -h /data Filesystem Size Used Avail Use% Mounted on /dev/sdb1 3.9T 195M 3.9T 1% /data make the appropriate entry in your /etc/fstab to mount /dev/sdb1 as ext3 on /data using "e2label"