It's the same thing. I assume now the sda is your ssd harddrive and sdb,sdc and sdd are the 1TB disks:
Create /dev/sdb Partition
Please follow the below instructions to create partition on /dev/sdb drive.
# fdisk /dev/sdb
Press ‘n‘ for creating new partition.
Then choose ‘P‘ for Primary partition. Here we are choosing Primary because there is no partitions defined yet.
Then choose ‘1‘ to be the first partition. By default it will be 1.
Here for cylinder size we don’t have to choose the specified size because we need the whole partition for RAID so just Press Enter two times to choose the default full size.
Next press ‘p‘ to print the created partition.
Change the Type, If we need to know the every available types Press ‘L‘.
Here, we are selecting ‘fd‘ as my type is RAID.
Next press ‘p‘ to print the defined partition.
Then again use ‘p‘ to print the changes what we have made.
Use ‘w‘ to write the changes.
Note: We have to follow the steps mentioned above to create partitions for sdc & sdd drives too.
# mdadm --create /dev/md0 --level=5 --raid-devices=3 /dev/sdb1 /dev/sdc1 /dev/sdd1
now check if raid is done:
# cat /proc/mdstat
now you can create partitions on /dev/md0
Good luck!
I extracted the instructions from http://www.tecmint.com/create-raid-5-in-linux/