<![CDATA[mmcblk0 "error -145" (sdcard)]]>I've tried 2 different cards now on my Omega2+, (8GB and 32GB), and whenever I insert either, I get a bunch of errors about failure to read blocks. They're both formatted ext4, and both work without issue in other devices. Is it possible my Omega2+ has a faulty SD reader, or is this a common problem? I know they're inexpensive, but if this is a known issue, I'd prefer not to throw good money after bad.

]]>http://community.onion.io/topic/4133/mmcblk0-error-145-sdcardRSS for NodeSun, 10 May 2026 11:11:33 GMTWed, 13 May 2020 17:05:03 GMT60<![CDATA[Reply to mmcblk0 "error -145" (sdcard) on Wed, 13 May 2020 17:05:03 GMT]]>I've tried 2 different cards now on my Omega2+, (8GB and 32GB), and whenever I insert either, I get a bunch of errors about failure to read blocks. They're both formatted ext4, and both work without issue in other devices. Is it possible my Omega2+ has a faulty SD reader, or is this a common problem? I know they're inexpensive, but if this is a known issue, I'd prefer not to throw good money after bad.

]]>http://community.onion.io/post/21656http://community.onion.io/post/21656Wed, 13 May 2020 17:05:03 GMT<![CDATA[Reply to mmcblk0 "error -145" (sdcard) on Wed, 13 May 2020 18:04:29 GMT]]>@William-Allen What firmware version are you using? Are you using your Omega2+ on an expansion board?

My experience with sdcard failures have always related to one of two issues. 1) Insufficient power; 2) poor seating in the expansion card, which probably was causing insufficient power.

On the Omega 2S+ I've had issues with a poor ground connection on my custom board so I think the general pattern of the issue is one of power supply.

]]>http://community.onion.io/post/21657http://community.onion.io/post/21657Wed, 13 May 2020 18:04:29 GMT<![CDATA[Reply to mmcblk0 "error -145" (sdcard) on Wed, 13 May 2020 21:37:46 GMT]]>@crispyoz Thanks for the response!

Yes, an expansion board, using the latest firmware. I already reseated the controller after inspecting the SD slot for any obvious signs of damage.

I'll look into the power issue. If I connect, say, a 2.4A charger cable to the microUSB slot of the expansion board, should that provide sufficient current, or should I feed the MCU v_in pin directly from a power supply?

]]>http://community.onion.io/post/21658http://community.onion.io/post/21658Wed, 13 May 2020 21:37:46 GMT<![CDATA[Reply to mmcblk0 "error -145" (sdcard) on Wed, 13 May 2020 23:26:17 GMT]]>@William-Allen 2.4A Micro USB supply made no difference. Not sure if the input is current-limited somehow. Also, USB thumb drive works fine, and I'm guessing that draws more current (of course not through the MCU...)

]]>http://community.onion.io/post/21659http://community.onion.io/post/21659Wed, 13 May 2020 23:26:17 GMT<![CDATA[Reply to mmcblk0 "error -145" (sdcard) on Thu, 14 May 2020 09:41:13 GMT]]>@William-Allen From my experience there is no underlying issue with Omega and SD Cards, all of my IoT devices have SD Cards installed and I have a large numberof them out in the field.

2.4A is plenty, however not all power supplies are created equal, there is a lot of "less than ideal" power supply devices on the market. I would try powering the device using different sources and see if this improves things.

Others may be able to provide other tips to assist you.

]]>http://community.onion.io/post/21661http://community.onion.io/post/21661Thu, 14 May 2020 09:41:13 GMT<![CDATA[Reply to mmcblk0 "error -145" (sdcard) on Fri, 15 May 2020 05:42:23 GMT]]>Thanks crispyoz. I tried a few different PSUs and reflashed the firmware, but no luck. I ordered a couple more so hopefully I'll have better luck with those.

]]>http://community.onion.io/post/21664http://community.onion.io/post/21664Fri, 15 May 2020 05:42:23 GMT