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Forum Discussion
Harddisk with Power Disable Pin (HGST)
Hi,
In this page, for part selector of HGST disks:
https://www.hgst.com/products/hard-drives/ultrastar-he12
They talk about SATA 3.3 specifications and the new "Power Disable Pin" feature
If not supported by controller, we need a molex adaptor or the disk won't spin-up
So, does my 524X unit support these hard disks or they won't spin-up ?
Seems like all 12TB HGST SATA HDD have this option
9 Replies
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It's an optional feature, so just make sure you get a drive model without it.
I doubt Netgear has tied Pin3 to 3.3V (SATA has never actually used 3.3V, AFAIK, even though the specification allowed for it), but somebody from Netgear will have to confirm. There is no adapter that would work on a NAS or server, as you cannot install an adapter on the power connection and still insert the drive all the way.
I am surprised HGST has not provided a jumper to disable the feature.
We didn't use Pin 3 on the connector of backplane (No Connection) on all desktop models.
Since Pin 3 is no connection, that is this pin is floating, no guarantee the power level.
If you use the HDD with PWDIS, it may or maynot spin up.
Highly recommand to use the HDD which is not support PWDIS feature.
Frank888, do you have access to a SATA 3.3 spec? Every article I see says that all that is necessary is that pin 3 not be connected to anything above 2.1V unless it's the actual PWDIS discrete. The implication is there is a pull-down on the signal, so floating the other side is just fine. In fact, HGST and others recommend just using a MOLEX 4-pin to SATA power adapter since the MOLEX has only +5 and +12V, leaving pins 1-3 floating. Personally, I'd just cut the 3.3V wire where it's possible (which should be all cases where the MOLEX adapter is also an option)..
But while it's still an option, just getting the drive version without that feature is the best move.
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