Facebook went a bit farther. https://engineering.fb.com/core-data/under-the-hood-facebook-s-cold-storage-system/ https://engineering.fb.com/core-data/under-the

Facebook went a bit farther. https://engineering.fb.com/core-data/under-the-hood-facebook-s-cold-storage-system/ https://engineering.fb.com/core-data/under-the-hood-facebook... > The biggest change was allowing only one drive per tray to be powered on at a time. In fact, to ensure that a software bug doesn’t power all drives on by mistake and blow fuses in a data center, we updated the firmware in the drive controller to enforce this constraint. The machines could power up with no drives receiving any power whatsoever, leaving our software to then control their duty cycle.