sentences:  The drive electronics waits for the SATA Data Phy (Physical I/F) to activate to spin-up the drive.The computer system BIOS and/or RAID controller or RAID driver set can delay and control when the different drives will spin-up.With Western Digital hard disk drives, Pin 11 of the SATA Power Interface controls whether Staggered Spin-Up (SSU) is enabled or not.