Port selectors Due to this feature two hosts can connect to one drive. Therefore, if one of the hosts fails, the second host will act as a spare, so that access to the storage is maintained. This type of redundancy is essential for video surveillance.
Native command queuing Native command queening is a feature to improve the hard disk performance by reordering the commands sent by the computer to the hard disk drive. Naturally Commands will arrive at a disk to read or write from different locations on the disk.