Asus Pedestal Server TS100-E4/PI2 - Manual (Page 32)

Chapter 2: Hardware setup 2-14
Connect the 15-pin Serial ATA
power plug to the Serial ATA
power connector at the back of
the drive.
OR
Use either the SATA power connector OR the legacy 4-pin power
connector. DO NOT use both to prevent damage to components and to
keep the system from becoming unstable.
8. The first and second SATA HDD
install finished as show.