Unlike normal operating conditions, hard drives require considerably more power during the initial spin-up phase. Due to the nature of their design, spinning up the platters of each individual disk in configurations of 40 or more drives can put quite a strain on the PSU. In order to avoid overwhelming the power supply or expensive hardware upgrades, powering up groups of disks at timed intervals is a requirement for large scale storage configurations.
The Rocket 750’s Staggered Drive Spin-Up solution supports PUIS enabled hard drives and can reduce operating costs.
Click Here more for details.