Most modern SATA drives do not use the standard 5.25" type power connector as fitted to older IDE/ATA hard drives.
This cable converts the four pin 5.25" power connector from your PCs power supply to a 15 pin connection suitable for use with a SATA drive.
1.Power connector for SATA HDD
2.Connector: 15pin SATA / 4pin with latch--angled