I want to add a 1TB Barracuda 2.5 internal hard drive to my new Lenovo ThinkCenter M70s.  SATA 1 and SATA 2 are being used by a 256GB SSD and the optical drive.  There is a place to mount the new hard drive inside the case and there is also a spare SATA 3 data connector on the motherboard.  So far so good.  However, I can't figure out how to power the new HDD.  There is one power connection for SATA 1 and and another one for SATA 2, both being used, but there is no SATA 3 power connector, as far as I can see.  

I'm not an expert here and could use some guidance.  Is there somewhere else I can get the power for the new drive?

- look at the sticker on your PC for Machine Type Model MTM ( example 81W12345US , must contains 10 characters

[ to find exactly your PC model

[ if you can't find the connector for the third hard disk drive, try the optical drive connector, remove it from the optical drive, and connect it to the hard disk drive , until we find the specifications of your PC or a solution

[ but if you also need an optical drive and do not have the connector for the third HDD, you have two solutions: one would be to change the power supply with one that has more connectors, or to use an extension to existing connectors

@BlueBear1 wrote:

I want to add a 1TB Barracuda 2.5 internal hard drive to my new Lenovo ThinkCenter M70s.  ....  There is one power connection for SATA 1 and and another one for SATA 2, both being used, but there is no SATA 3 power connector, as far as I can see.  

The SATA power cables connect to the motherboard (as shown below), and they can have multiple drive connectors on the same cable.  Do you have one cable or two?  Any open drive connectors you could use?

Thanks for your reply.  Both SATA power connectors are being used.  One by the optical drive and the second one by the 256GB SSD.  I don't see any other power connectors.  I was reading that I might be able to use a power splitter cable to run power to the SSD and then my new Barracuda HDD.  However, I'm not an expert and I'm concerned about overloading the supply.  Is it safe to run both drives off one SATA power port?  I can't run the HDD off the other power cable going to the optical drive, because the connector to the optical drive contains both SATA power and SATA data connections in one connector (they're not separate connectors like in the case of the SSD). 

Thanks, here is the number:  MT-M 11EX-002JUM

this is your power supply 180W :

Link https://pcsupport.lenovo.com/us/en/products/desktops-and-all-in-ones/thinkcentre-m-series-desktops/thinkcentre-m70s/11ex/11ex002jum/parts/display/model

Thanks for looking up this information.

Thanks for your help.  I'll look into getting a good power splitter cable.