The Wiert Corner – irregular stream of stuff

Jeroen W. Pluimers on .NET, C#, Delphi, databases, and personal interests

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Archive for the ‘Flash-memory’ Category

Raspberr Pi with openSuSE: trying to fix a microSD card causing “A start job is running for File System Check on /dev/disk/by-id mmc” … some time elspased / no limit

Posted by jpluimers on 2026/06/15

I wrote about Raspberry Pi And The Story Of SD Card Corruption | Hackaday before, quoting my tweet

[Wayback/Archive] @hackaday I’m have been running a few Raspberry Pi systems with 8-32Gb micro-SD cards as web-dashboard with refreshes every few minutes or so: much write access. When using Sandisk (no matter the type) they last about a year, Samsung (no matter the type) cards last multiple years.

That post got scheduled when I was recovering from my rectum cancer treatments and coping with bad LAR-syndrome. The good news when writing is that I survived and LAR-syndrome is more manageable. The bad news is that at the time you read this some 75% of my peer group didn’t, including some good friends .

I write this post at time around 50% of the peer group have passed away. A kind of tribute to them: let them be remembered.

This time I am trying to see if a microSD card causing the boot to hang on starting with “A start job is running for File System Check on /dev/disk/by-id mmc” then containing  some time elapsed  followed by “/ no limit”.

Read the rest of this entry »

Posted in *nix, *nix-tools, Flash-memory, Linux, openSuSE, Power User, SD/miniSD/microSD/MMC, Storage, SuSE Linux, Tumbleweed | Leave a Comment »

That duh moment when you cannot read an SD card: it’s SDHC/SDXC in an SD card reader; Secure Digital – Wikipedia

Posted by jpluimers on 2019/02/18

That moment you facepalm yourself because you forgot that particular machine won’t read SD cards because they are too big for the SD card reader in it: SD goes up to 4 gigabyte, anything bigger (nowadays basically everything) requires SDXC or SDHC compatible readers.

Quotes from Wikipedia:

However, older host devices do not recognize SDHC or SDXC memory cards, although some devices can do so through a firmware upgrade.[11] Older Windows operating systems released before Windows 7 require patches or service packs to support access to SDHC cards.[12][13][14]

Older host devices generally do not support newer card formats, and even when they might support the bus interface used by the card,[6]there are several factors that arise:

  • A newer card may offer greater capacity than the host device can handle (over 4 GB for SDHC, over 32 GB for SDXC).
  • A newer card may use a file system the host device cannot navigate (FAT32 for SDHC, exFAT for SDXC)
  • Use of an SDIO card requires the host device be designed for the input/output functions the card provides.
  • The hardware interface of the card was changed starting with the version 2.0 (new high-speed bus clocks, redefinition of storage capacity bits) and SDHC family (Ultra-high speed (UHS) bus)
  • UHS-II has physically more pins but is backwards compatible to UHS-I and non-UHS for both slot and card.[27]
  • Some vendors produced SDSC cards above 1GB before the SDA had standardized a method of doing so.
SD compatibility table
SDSC card SDHC card SDHC UHS card SDXC card SDXC UHS card SDIO card
SDSC slot Yes No No No No No
SDHC slot Yes Yes Yes[a] No No No
SDHC UHS slot Yes[a] Yes[a] Yes[b] No No No
SDXC slot Yes Yes Yes[a] Yes Yes[a] No
SDXC UHS slot Yes[a] Yes[a] Yes[b] Yes[a] Yes[b] No
SDIO slot Varies Varies Varies Varies Varies Yes

–jeroen

Posted in Development, Flash-memory, Hardware Interfacing, Power User, SD/miniSD/microSD/MMC, Storage, USB | Leave a Comment »

Micro SD Cards for Development Boards – Classes, Tools, Benchmarks, Reliability, and Tips & Tricks

Posted by jpluimers on 2018/11/09

Last year I bumped into a great article about the state of the art on [WayBack] Micro SD Cards for Development Boards – Classes, Tools, Benchmarks, Reliability, and Tips & Tricks.

I wonder what has changed by now.

Some references from the above article:

–jeroen

Via: [WayBack] Informations about (micro) SD cards specifically geared towards their use in development boards such as the +Raspberry Pi+Samsung Electronics and +SanD… – Jean-Luc Aufranc – Google+

Posted in Flash-memory, Power User, SD/miniSD/microSD/MMC, Storage | Leave a Comment »