TerraMaster Forum

Posted: **21 Feb 2026, 02:04**

I have the F4-425 Plus and have installed TrueNAS. Everything is up and running "fine". However, /var/log/netdata/error.log is being written approximately every second with:

Unexpected error reading partitions for device: '/dev/sdc'
Traceback (most recent call last):
File "/usr/lib/python3/dist-packages/middlewared/utils/disks_/disk_class.py", line 397, in partitions
return read_gpt(dev_fd or self.devpath, self.lbs)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
File "/usr/lib/python3/dist-packages/middlewared/utils/disks_/disk_io.py", line 86, in read_gpt
dev_fd = os.open(devobj, os.O_RDONLY)
^^^^^^^^^^^^^^^^^^^^^^^^^^^^
PermissionError: [Errno 13] Permission denied: '/dev/sdc'

This is the ~250MB USB/SATA DOM on my system. I don't see any way to disable this drive in BIOS. Is there anything I can do to remove/hide it?

Posted: **21 Feb 2026, 11:12**

Since your system is running TrueNAS rather than the TerraMaster TOS operating system, disk handling and device management are controlled by TrueNAS itself. We are unable to understand its configuration mechanisms, including how to hide or ignore specific devices (such as /dev/sdc).

For accurate guidance, we recommend consulting the official TrueNAS documentation or community forums, where they can provide specific instructions for this platform.

Posted: **22 Feb 2026, 09:25**

TMjack wrote: ↑21 Feb 2026, 11:12 Since your system is running TrueNAS rather than the TerraMaster TOS operating system, disk handling and device management are controlled by TrueNAS itself. We are unable to understand its configuration mechanisms, including how to hide or ignore specific devices (such as /dev/sdc).

For accurate guidance, we recommend consulting the official TrueNAS documentation or community forums, where they can provide specific instructions for this platform.

Based on photos available online, it appears the SATA DOM is just screwed in and it’s a USB header port. Can the SATA DOM be removed and stored aside from the machine without issue? Or will it mess up even booting bios or something?

Posted: **22 Feb 2026, 10:26**

Kaitlyn2004 wrote: ↑22 Feb 2026, 09:25

The SATA DOM can be removed and stored outside the machine without any issues. It is a boot device used solely for installing TOS.

TerraMaster Forum

[Help] Endless errors when using TrueNAS on 425 series

[Help] Endless errors when using TrueNAS on 425 series

Re: [Help] Endless errors when using TrueNAS on 425 series

Re: [Help] Endless errors when using TrueNAS on 425 series

Re: [Help] Endless errors when using TrueNAS on 425 series [SOLVED]