TerraMaster Forum

The Crucial/Micron MX500 report Unusued_Rsvd_Blk_Cnt_Tot, which seems to be confusing TOS' SMART/Drive Health assessment, putting both brand new, verified (via Crucial Storage Executive) healthy 2TB volumes in "at-risk" status on my dashboard.
This SMART attribute is set by Crucial at the factory, and counts down from the stated value until 0. Once it reaches 0, the drive is locked in a read-only state and has failed.
The TOS SMART dashboard/assessment is treating this value backwards, instead alerting me to the fact that my drive still has a significant number of Unused Reserved (Super)Blocks.

I'd like to see this behavior fixed.

https://www.crucial.com/support/article ... smart-data

We have to verify the red marked attribute here first, will get back to you as soon as possible.

I can confirm that I have one of these drives and also have the same problem. It says I have 45 unused blocks left but the drive reports as "In Risk"

It's the reason that this parameter Unused_Rsvd_Blk_Cnt_Tot is added in Crucial SSD's SMART information. We will fix it in later version.

TMSupport wrote: ↑01 Jul 2021, 09:58 It's the reason that this parameter Unused_Rsvd_Blk_Cnt_Tot is added in Crucial SSD's SMART information. We will fix it in later version.

Thank you so much for looking into the issue, confirming it, and committing to fixing it!
I hope this fix will be valid for the ARM TNAS units as well, since that is what I am using.

Looks like TOS 4.2.15 just ignores the Crucial Unused_Block_Count SMART attribute, so the drives show healthy (yay!), but that is still an important metric to keep an eye on...

Hopefully a future update makes this SMART attribute work properly, but I'm thankful they've looked into the issue.