Card Reader

[eghoward]

My USB Card Reader is not recognised when plugged into a USB port, though the USB memory stick is recognised

[wintpe]

you may be right that its not recognised, but we re not pycic and cant read your
mind to find out any more info.
would realy help if you posted it upfront.
hence why i posted the help us to help you post.

so lsusb, will identify wether the reader is being seen on the usb bus.

we may see an id thats not yet supported by the kernel, or we might see nothing indicating a connectivity issue.

what motherboard is this, see my post about iommu and gigabyte boards, ths can make
some usb ports not work.

theres al sorts of possibilities, but with nothing to go on its just guessing

regards peter

[doktor5000]

hence why i posted the help us to help you post.

Which implies that people search or actually read before they post ...

[eghoward]

Did not know about the "lsusb". Tryed a different card reader and it worked.
Thanks for your help
Edward
Registered Linux User No. 224802

[doktor5000]

Please mark the thread accordingly by editing the topic of the first post and prefix it by [DONE], thanks

[merlin]

USB Card readers can work in to 2 ways:

a) SD card inserted then Card reader connected to USB - Linux sees the device as a USB stick (Mass Storage device)
b) empty Card reader is connected to USB then SD card is inserted - Linux sees a USB SCSI device with no volume (no card), waits for card insertion, inserted card and card reader is seen as a USB stick.

Sometimes detection of the inserted card fails. Some cards work better than others. Therefore, try using option a) and insert the card into the card reader before connecting the card reader to USB. This avoids dynamic detection of a card being present.

Also note that there are different types of SD card and the USB card reader might not be able to access them such as SDHC (high speed). So you need to check that the card is compatible with the card reader.

udev is the Linux sub-system that monitors device connection and card insertion. Sometimes udev can malfunction if the card is incorrectly formatted. Note memory devices can be formatted with a partition table (MS-DOS or Apple GPT) or without a partition table (supperfloppy like a floppy disk). udev's rules can be confused by misinterpreting data in the first sector because it needs to detect the MBR (Master Boot Record) with a partition table is present or not.

My recommendation is to always use memory cards that have a partition table. This allows the system to be told the file system type from the partition table without the system guessing. Unfortunately, pre-formatted memory cards can come with or without partition tables. Even worse, formatting with Windows will retain the original format style, so if the memory card originally had a partition table, then the freshly formatted memory card will also have a partition table. But if the memory card had no partition table (supperfloppy) then the freshly formatted memory card will also have no partition table. This means that the Windows format feature cannot be used to add or remove a partition table and worse, the user does not know which format style was used.

All I am saying is, the situation may be more complex than you first thought.

[eghoward]

Thanks.
Changed the card reader and solved the problem. Surprisingly, a friend of mine was experiencing similar problem with different card reader at this very time, therefore it seemed there was a bug in Mageia4, just like the one with "pkcs11" in/etc.
Thanks again
Edward
Registered Linux user No. 224802

Solved

[isadora]

Please mark the topic accordingly.

You can do, by editing the title/subject in the first message, and pre-fix it with [SOLVED}.

Thank you!!!

[eghoward]

Solved

[doktor5000]

You can do, by editing the title/subject in the first message, and pre-fix it with [SOLVED].

Thank you!!!

[eghoward]

Solved

[doktor5000]

Please mark the thread accordingly by editing the topic of the first post and prefix it by [SOLVED], thanks