QNAP TS-419U Turbo NAS is the 4-bay, 1U chassis multi-functional network attached storage (NAS) server designed for small and mid-sized business who is looking an affordable and low-powered network storage solution. The TS-419U can be easily installed and maintained in the server room. It is an ideal solution for mass data backup, management and sharing. Moreover, the NAS supports excellent hardware design, outstanding performance, high system reliability and expandability, and numerous powerful software applications. The TS-419U adopts Marvell 1.2GHz CPU and 512MB DDRII memory. It supports 4 2.5-inch and 3.5-inch hot-swappable SATA hard drives, 2 Gigabit LAN ports for multi-IP settings and port trunking (7 bonding modes). The NAS is equipped with 4 USB ports and 2 eSATA ports for storage expansion or external data backup. The TS-419U supports RAID 0/ 1/ 5/ 6/ 5+spare, single and JBOD disk configurations. The unique Online RAID Capacity Expansion and Online RAID Level Migration allow the users to expand the storage capacity of the RAID configuration and upgrade the RAID level without turning off the server respectively. The RAID recovery feature secures the server data against accidental removal of the hard drives. In addition, the TS-419U supports NAS and iSCSI applications to provide a low-cost, highly flexible and efficient IP SAN solution for SMB users. Up to 8 iSCSI targets can be created on the NAS for storage expansion of the PC or other servers and backup destination of the database servers and mail servers, etc. The TS-419U is featured with virtual disk drive (VDD) by built-in iSCSI initiator that other iSCSI devices on the network can be added to expand the storage capacity of the NAS. The TS-419U supports abundant powerful applications which can be accessed across Windows, Mac, Linux, and UNIX.