~~So as the title says, I am installing some Toshiba MG08 drives (MG08ACA16TA) drives. My computer's SATA power connectors don't have 3.3V line connected, only 5 and 12 (It's an HP Elitedesk 800 SFF). Without 3.3V they don't spin up and are not detected, with 3.3V they do (I tested this by connecting another PSU that does have the 3.3V line on the Sata power connectors).~~
~~The drives themselves only list 5V and 12V power draw on them at 0.9A and 0.75A~~
~~I'm looking to just add a regulator from 5 or 12V down to 3.3V, but am wondering if these drives will draw much power from the 3.3V line and if a little LDO will cut it, or if I'm going to need a buck converter.~~
~~Anyone every encountered this before that can shine some light on the issue?~~
EDIT: so taping the 3.3V pin and testing with the USB to Sata adapter, the drives still spin up and show up, so looks like 3.3V is not the cause of the issue. I did measure the motherboard output of the PC with a multimeter to check that 5V and 12V are present, and they are. Also tested with a Sata SSD drive which did power up and show up. I'll go and test with some spare hard drives I guess, see if they work. Will post updates as I go along I suppose.