Because Cassandra's storage engine is very write-heavy, solid state drives (SSDs) should be considered for production. Cassandra should still run fine on a spinning disk. But in that case, be sure to configure the commit log[1] to be on a separate physical disk from the data directory. It is not necessary to employ a redundant array of independent disks (RAID) on your data or commit log drives (RAID 0 should be fine). Cassandra's replication to other nodes protects against data loss. To ensure the proper handling of larger files, be sure to format the drive using either the XFS (preferable) or ext4 filesystems.
Additionally, be sure to disable swap space. Cassandra uses RAM the way it does because it is fast. Swapping RAM to disk slows this down tremendously. If your node is using swap space, you can use the swapoff command, and then edit your /etc/fstab and remove or comment out the swap entry.