# Mmc failure possible?

**URL:** <https://discourse.nodered.org/t/mmc-failure-possible/100729>\
**Category:** Industrial\
**Created:** [7 April 2026 16:49 UTC](https://discourse.nodered.org/t/mmc-failure-possible/100729 "2026-04-07T16:49:47Z")\
**Posts on this page:** 7\
**Page:** 1

<div class="post-metadata">

**Author:** ![Geppy57](https://avatars.discourse-cdn.com/v4/letter/g/57b2e6/32.png) [@Geppy57](https://discourse.nodered.org/u/Geppy57)\
**Post date:** [7 April 2026 16:49 UTC](https://discourse.nodered.org/t/mmc-failure-possible/100729/1 "2026-04-07T16:49:47Z")

</div>

Hello.  
From some days, an ARM device with node-red give me some error because of EROFS error during write on mmc card.  
I see on journal the evolution in EXT4-fs functionality.  
The following are the relative lines from the installation to now.

After some days :  
Oct 04 17:11:15 iot-sthm25 kernel: EXT4-fs (mmcblk0p1): mounted filesystem with ordered data mode. Opts: (null)  
Oct 04 17:11:15 iot-sthm25 kernel: EXT4-fs (mmcblk0p1): re-mounted. Opts: (null)  
One month later :  
Nov 06 17:51:49 iot-sthm25 kernel: EXT4-fs (mmcblk0p1): INFO: recovery required on readonly filesystem  
Nov 06 17:51:49 iot-sthm25 kernel: EXT4-fs (mmcblk0p1): write access will be enabled during recovery  
Nov 06 17:51:49 iot-sthm25 kernel: EXT4-fs (mmcblk0p1): orphan cleanup on readonly fs  
Nov 06 17:51:49 iot-sthm25 kernel: EXT4-fs (mmcblk0p1): 1 orphan inode deleted  
Nov 06 17:51:49 iot-sthm25 kernel: EXT4-fs (mmcblk0p1): recovery complete  
Nov 06 17:51:49 iot-sthm25 kernel: EXT4-fs (mmcblk0p1): mounted filesystem with ordered data mode. Opts: (null)  
Nov 06 17:51:49 iot-sthm25 kernel: EXT4-fs (mmcblk0p1): re-mounted. Opts: (null)  
Some days ago :  
Apr 01 10:04:43 iot-sthm25 kernel: EXT4-fs (mmcblk0p1): INFO: recovery required on readonly filesystem  
Apr 01 10:04:43 iot-sthm25 kernel: EXT4-fs (mmcblk0p1): write access will be enabled during recovery  
Apr 01 10:04:43 iot-sthm25 kernel: EXT4-fs (mmcblk0p1): recovery complete  
Apr 01 10:04:43 iot-sthm25 kernel: EXT4-fs (mmcblk0p1): mounted filesystem with ordered data mode. Opts: (null)  
Apr 01 10:04:43 iot-sthm25 kernel: EXT4-fs (mmcblk0p1): re-mounted. Opts: (null)  
Apr 01 10:04:49 iot-sthm25 kernel: EXT4-fs error (device mmcblk0p1): htree\_dirblock\_to\_tree:1003: inode #50303: comm dbus-daemon: Directory block\>

You think that can be a mmc failure? Change the mmc can be a solution?  
BR

---

<div class="post-metadata">

**Author:** ![Colin](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/colin/32/17040_2.png) [@Colin](https://discourse.nodered.org/u/Colin)\
**Post date:** [7 April 2026 17:04 UTC](https://discourse.nodered.org/t/mmc-failure-possible/100729/2 "2026-04-07T17:04:31Z")

</div>

Do those appear after the power is suddenly removed?  
If not then replace it.

---

<div class="post-metadata">

**Author:** ![Geppy57](https://avatars.discourse-cdn.com/v4/letter/g/57b2e6/32.png) [@Geppy57](https://discourse.nodered.org/u/Geppy57)\
**Post date:** [7 April 2026 17:24 UTC](https://discourse.nodered.org/t/mmc-failure-possible/100729/3 "2026-04-07T17:24:06Z")

</div>

Hello.  
The last line :  
kernel: EXT4-fs error (device mmcblk0p1): htree\_dirblock\_to\_tree:1003: inode #50303: comm dbus-daemon: Directory block\>  
appears continuosly when system runs.  
I look to journal because now is not possible write files from node-red.  
It is not possible also to modify node programs because of this error :  
"Error saving flows: EROFS: read-only file system, unlink '/root/.node-red/.flows.json.backup'"  
"Error: EROFS: read-only file system, unlink '/root/.node-red/.flows.json.backup'"  
This happens because after mmc failure all unit became read only, probably for defective mmc.  
BR

---

<div class="post-metadata">

**Author:** ![TotallyInformation](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/totallyinformation/32/31_2.png) [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)\
**Post date:** [7 April 2026 18:06 UTC](https://discourse.nodered.org/t/mmc-failure-possible/100729/4 "2026-04-07T18:06:25Z")

</div>

Always have a space card to hand, it is the first thing to check.

---

<div class="post-metadata">

**Author:** ![marcus-j-davies](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/marcus-j-davies/32/103435_2.png) [@marcus-j-davies](https://discourse.nodered.org/u/marcus-j-davies)\
**Post date:** [7 April 2026 18:49 UTC](https://discourse.nodered.org/t/mmc-failure-possible/100729/5 "2026-04-07T18:49:48Z")

</div>

> [@TotallyInformation](#):
>
> Always have a space card to hand, it is the first thing to check.

Or a spare card.  
This isn't the Artemis forums @TotallyInformation😉

---

<div class="post-metadata">

**Author:** ![TotallyInformation](https://sea2.discourse-cdn.com/flex026/user_avatar/discourse.nodered.org/totallyinformation/32/31_2.png) [@TotallyInformation](https://discourse.nodered.org/u/TotallyInformation)\
**Post date:** [7 April 2026 18:51 UTC](https://discourse.nodered.org/t/mmc-failure-possible/100729/6 "2026-04-07T18:51:29Z")

</div>

Haha, rushing a reply as I went off to cook tea. 😃

Still, I'm sure that the Artemis crew have plenty of spare space cards!

---

<div class="post-metadata">

**Author:** ![system](https://us1.discourse-cdn.com/flex026/uploads/nodered/original/1X/d073cd938eafa2e558d7c2cd59003b3ef4963033.png) [@system](https://discourse.nodered.org/u/system)\
**Post date:** [21 April 2026 18:52 UTC](https://discourse.nodered.org/t/mmc-failure-possible/100729/7 "2026-04-21T18:52:20Z")

</div>

Closed on 21 April 2026 18:52 UTC

This topic was automatically closed 14 days after the last reply. New replies are no longer allowed.