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Re: Trouble using SDXC 128GB card

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Hello all, thanks for the replies to this issue. I currently don't have 
the time to delve into this any further, but I did format the card in my 
camera and took a few 100 MB of video on it. The video plays back fine 
on the camera itself, also after turning the camera off and removing and 
re-inserting the card. So the card is OK, it just doesn't work on my 
Lenovo T480s in both Debian 11 and Windows 10. I can write data to the 
raw device (i.e., /dev/hdb) but it reads back only garbage, without 
getting any I/O error. I suspect it has to do with the computer's 
hardware. Still weird, given that SDHC cards work fine, and this is a 
fairly recent machine with a brand-new BIOS update. I'll procure another 
card reader and report back.

Am 26.10.2021 20:08 schrieb Dan Ritter:
> Musbur wrote:
>> Hello,
>> 
>> I'm using a Lenovo Thinkpad T480s. Recently I bought a SanDisk Extreme
>> Pro 128GB SDXC card for my digital camera, but I quickly found out 
>> that
>> the system can't work with that card. It show up as /dev/sdb, I can 
>> use
>> fdisk and everything without error, but when remove and re-insert the
>> card, the partition table is gone. When I boot the computer in Win10
>> (latest version), the card shows up as 'SDXC' but cannot be accessed.
>> The camera can format, read and write just fine.
>> 
>> According to the specs, the builtin card reader of the T480s is SDXC
>> compatible. Is there a driver for Linux that can make this card work?
>> The BIOS of the computer has just been updated a week ago. Is the
>> hardware just not compatible?
>> 
>> Needless to say, my SDHC cards (up to 32GB) work fine in this machine.
> 
> It's is quite plausible that you have a counterfeit card, with
> an actual capacity of 8-16GB.
> 
> Try this (assuming it's still /dev/sdb when you plug it in):
> 
> mkfs.ext4 /dev/sdb
> mkdir /mnt/tmpcrd
> mount /dev/sdb /mnt/tmpcrd
> 
> Now download something big, like
> 
> wget
> https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-11.1.0-amd64-netinst.iso
> 
> which is 378MB.
> 
> for i in `seq 1 200`; do cp debian-11.1.0-amd64-netinst.iso \
> /mnt/tmpcrd/file.$i; done
> 
> That will get you 200 files on the SD card, each 378MB, for a total of 
> about
> 75,600 MB, which is more than half the capacity of the disk.
> 
> Next:
> 
> sync
> umount /dev/sdb
> 
> pull the card out, pop it back in.
> 
> mount it at /mnt/tmpcrd again.
> 
> Debian says the SHA256 hash of that file is
> 02257c3ec27e45d9f022c181a69b59da67e5c72871cdb4f9a69db323a1fad58093f2e69702d29aa98f5f65e920e0b970d816475a5a936e1f3bf33832257b7e92
> 
> so let's calculate it for the last 20 files:
> 
> for i in `seq 180 200`; do sha256sum /mnt/tmpcrd/file.$i; done
> 
> You should get 20 copies of the same hash as above. If you don't
> -- you have a a defective, possibly counterfeit card.
> 
> -dsr-

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Thread

Trouble using SDXC 128GB card Musbur <musbur@posteo.org> - 2021-10-26 17:50 +0200
  Re: Trouble using SDXC 128GB card Dan Ritter <dsr@randomstring.org> - 2021-10-26 20:30 +0200
    Re: Trouble using SDXC 128GB card Musbur <musbur@posteo.org> - 2021-10-29 09:50 +0200
      Re: Trouble using SDXC 128GB card Stefan Monnier <monnier@iro.umontreal.ca> - 2021-10-29 16:00 +0200
  Re: Trouble using SDXC 128GB card David Wright <deblis@lionunicorn.co.uk> - 2021-10-26 22:10 +0200
  Re: Trouble using SDXC 128GB card David Christensen <dpchrist@holgerdanske.com> - 2021-10-27 03:10 +0200
  Re: Trouble using SDXC 128GB card Anssi Saari <as@sci.fi> - 2021-10-27 09:20 +0200
  Re: Trouble using SDXC 128GB card Dieter Rohlfing <dr-erc@gmx.net> - 2021-10-27 10:50 +0200

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