I recently got a couple of SAS3 drives from a friend, they were reported as working, with the partition tables removed prior to me receiving them. I have a Supermicro Server with a SAS3 backplane with a Supermicro JBOD connected to it. Currently between the server and the JBOD I have 44 SATA disks b…

Just a very wild guess here, but could you check the sector size of those disks? If they’re 520b they may not show up because truenas expects 512b

I would think that even 520 byte sector, (or the 4K equiv), will show up with lsblk. My own thought is that the disks may have power disable pins. (You don’t list these drive’s model…) This feature is more common with SAS drives than SATA drives. The test is to try and block off one of the drive’s …

One post on the subject of 520b: [image] 520 Sector Size Compatibility TrueNAS General Hey all! Hoping this is the right spot for this, but if not I apologize… TL/DR: Does TrueNAS support 520 sector drives currently? If not, are there any plans to support it…

I believe this is going to be the answer. It is a Western Digital DC HC560, P/N: 0F38652 which corresponds to the SAS 20TB Secure Erase. The full Model is WUH722020BL5204. I dug through the datasheet for the drive, the 5204 at the end of the model, the 52 corresponds to 512e sector size, the 0 is Po…

I figured this was going to be the answer, it made sense, and when I pulled the drives after they had sat in the chassis all night they were still cool to the touch, so even more evidence that they were not spinning up. I blocked pin 3 on the drives and they still were not being recognized. Worried …

[image] g4m3r7ag: Could it have something to do with how the drives had the partitions removed? No, not really. If the drive appears to be spinning up, my next thought is that the SAS controller is not setup with IT firmware, (Integrated Target, as opposed to IR, Integrated RAID firmware). B…

Yea they are both HBA’s, not RAID controllers, and I’ve tried using two different backplanes connected to two different HBA’s. One backplane/HBA is SAS2 the other is SAS3.

Well I confirmed the drives are working, a friend has a workstation with a SAS controller in it, we connected the drives and booted into the LSI controller and it recognized both drives. Still no idea why they are not being recognized in my TrueNAS machine. We initially only connected one drive and …

Just an update on this in case someone finds it later. I fully powered down the TrueNAS host as well as the JBOD, inserted the two WD drives that would not show up, powered everything back on and they were showing as available/unused disks. Not entirely sure why the hotplug was not working.

Used disk not showing up

TrueNAS General

Apollo February 18, 2026, 5:00pm 4

One post on the subject of 520b:

Topic		Replies	Views
SAS drives not being detected TrueNAS General Hardware	8	514	November 26, 2025
TrueNAS not recognizing (some) new hard drives TrueNAS General	13	640	October 14, 2025
LSI 9300-16i - All my drives smaller than 10tb's TrueNAS General Hardware	5	269	June 3, 2025
Help with drive assignment TrueNAS General SCALE , Hardware	8	147	October 23, 2025
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Used disk not showing up

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