Seagate Enterprise Capacity 2.5 HDD Constellation Product Manual page 16

Table 2: DC power requirementss
1000GB drive (Standard & SED model)
*During periods of drive idle, some offline activity may occur according to the S.M.A.R.T. specification, which may increase acoustic and
power to operational levels.
10 Constellation.2 Serial ATA Product Manual, Rev. F