To accommodate PC user's need for more storage flexibility and convenience, SilverStone created a line of front bay storage products called the FS series. These are 5.25" or 3.5" bay chassis designed to fit SAS/SATA drives. FS305-E features hot-swap functions to quickly and conveniently swap or upgrade drives, built-in cooling fan to ensure drives run cool during operation and independent LED indicators to monitor drive status at just a glance, lastly, each drive tray is equipped with metal key lock for additional security. For those that's in need of upgrading their current PC with more drives, SilverStone's FS305-E is a magnificent choice for an instant upgrade.