TrueNAS 25.04.2.4 Community CPU: AMD Ryzen 9 7900X 12-cord Motherboard: Gigabyte Aorus B650 Elite AX HBA: LSI 9300-16i Pool 1: 5x14TB RAIDZ1 Pool 2: 5x8TB RAIDZ1 I’m completely baffled. I acquired 2x 14TB SATA hard drives and attempted to add them to my TrueNAS server. I first tried hot-pluggi…

[image] prez02: This sounds like a 3.3V problem… That’s my guess as well. @Dan_Nielsen It’s most likely that your backplane has pins 1-3 all bound together, because that used to be acceptable. Pin 3 is your problem: [image] If the drive supports PWDIS and it gets voltage on that port, it…

How do you power the drives? This sounds like a 3.3V problem…

Ah! This explains why “older” hard drives work fine and newer drive (with PWDIS) don’t. So, I’m guessing the easiest way to address this would be to use some kapton tape on Pin 3 to prevent the voltage/connection? Or is there a better solution (short of replacing the backplane)? Very helpful - tha…

[image] Dan_Nielsen: I’m guessing the easiest way to address this would be to use some kapton tape on Pin 3 It’s easier to cover Pins 1 - 3. Kapton tape is harder to work with when the cut is too narrow. I used the 3/8 inch kind.

Check your drives if you do this. Nearly all drives use 5V and 12V only, but some (rare) ones, usually tiny SSDs, have demanded 3.3v power - but it’s probably been a decade since I’ve seen one, and IIRC it was a 1.8" “micro-SATA” drive which wouldn’t have fit. And to think, if they’d found a way to…

I applied some tape and it worked perfectly! Both new hard drives are now working properly. Huge thanks for everyone’s help! So I extended an existing vdev via the UI and it immediately started the expansion job and won’t let me attach the second drive until that finishes? It’s going to take ~32 ho…

I wanted to know also [image] TrueNAS not recognizing (some) new hard drives TrueNAS General What are the hard drive models you are having trouble with?

I’d guess: HGST Ultrastar or WD Gold.

WD Ultrastar DC HC530 14TB WUH721414ALE601

TrueNAS not recognizing (some) new hard drives

TrueNAS General

SmallBarky October 8, 2025, 8:51pm 2

What are the hard drive models you are having trouble with?

Topic		Replies	Views
Used disk not showing up TrueNAS General	9	180	April 29, 2026
SAS drives not being detected TrueNAS General Hardware	8	476	November 26, 2025
Hard Drives Not Recognized in New Server TrueNAS General Hardware	12	302	September 4, 2025
Help with drive assignment TrueNAS General SCALE , Hardware	8	143	October 23, 2025
Seagate 12TB ironwolf drives not recognized TrueNAS General	6	1371	October 11, 2024

TrueNAS not recognizing (some) new hard drives

Related topics