BPN-SAS-846TQ Backplane and PWDIS

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cadamwil

Member
Jan 16, 2014
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Nashville, TN
Hello All,
I found a pretty good deal on a 14TB Ultrastar, but i has PWDIS built in. It looks like PWDIS resets the drive by providing 3.3v on Pin 3 of the SATA Power connector. In looking at the specs for the BPN-SAS-846TQ it's supplied power via the old school molex connector, so unless it has a buck converter to provide 3.3v, I should be good, correct? Has anyone tried these in a Supermicro SC846, or ideally one with the TQ backplane?

Adam
 

i386

Well-Known Member
Mar 18, 2016
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Yes, the backplane is supplied with power through molex connectors on the backside, but the drive receives power from the SFF-8482 connector on the front side of the backplane.
 

cadamwil

Member
Jan 16, 2014
52
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Nashville, TN
Yes, the backplane is supplied with power through molex connectors on the backside, but the drive receives power from the SFF-8482 connector on the front side of the backplane.
Right, I am aware of that, otherwise the drive wouldn't power on. My question is, is the backplane making and providing 3.3V on pin 3. If not, I can use drives with PWDIS without issue.
 

itronin

Well-Known Member
Nov 24, 2018
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Right, I am aware of that, otherwise the drive wouldn't power on. My question is, is the backplane making and providing 3.3V on pin 3. If not, I can use drives with PWDIS without issue.
Or you could just use some kapton tape on the the drive's 3.3v pin and use it...
 

kishine

New Member
Mar 8, 2023
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Can anybody confirm if we can use Hdd with pwdis on SC846 (any model). Hdd with pwdis are cheaper right now. Thank you
 

BlueFox

Legendary Member Spam Hunter Extraordinaire
Oct 26, 2015
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As mentioned previously, the backplane doesn't supply 3.3V, so it's not an issue.
 
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