On 2/7/2014 16:40, Timothy Murphy wrote: > my HP SuperMicro drive-bay. SuperMicro is OEMing for HP now? > In this the power connector(s) are in the same position > as the empty slot above, The 4 pins next to the SATA data connector on the Seagate drive are nonstandard. Their purpose is not documented in Seagate manual: http://goo.gl/t2lncu I doubt they are some kind of secondary power connector. Far more likely are a programming header, a debug port, an auxiliary feature output (e.g. drive activity LED), a configuration jumper... > (Unfortunately I cannot provide a photo at the moment, > as both my Android phone and my camera are out of action.) No need. The Newegg page shows the connectors clearly: http://www.newegg.com/Product/Product.aspx?Item=N82E16822148451 If this is a standard SATA enclosure, only the two keyed edge connectors need to be used, as Kai says.