Re: Trouble using SDXC 128GB card

From	Dieter Rohlfing <dr-erc@gmx.net>
Newsgroups	linux.debian.user
Subject	Re: Trouble using SDXC 128GB card
Date	2021-10-27 10:50 +0200
Message-ID	<DcMNb-7b5-5@gated-at.bofh.it> (permalink)
References	<DcwS5-5Iv-1@gated-at.bofh.it>
Organization	linux.* mail to news gateway

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Am Tue, 26 Oct 2021 15:41:33 +0000
schrieb Musbur <musbur@posteo.org>:

>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.
>.....
>The camera can format, read and write just fine.

Perhaps this link

https://github.com/ThomasKaiser/Knowledge/blob/master/articles/A1_and_A2_rated_SD_cards.md#application-performance-class-2-a2

may explain, why you have these problems.

Specially the following text is interesting:

>Application Performance Class 2 (A2)
>A2 promises even better performance with 4000/2000 read/write IOPS
>minimum but there's a problem since as outlined by the SD Association A2
>cards show "much higher performance than A1 performance by using
>functions of Command Queuing and Cache".
>
>Cache and Command Queuing require host (driver) support since the host
>needs to activate those new features first. The cache feature on A2 rated
>cards makes use of volatile RAM on the card requiring the host to learn
>new commands to issue flushing the cache (involving the risk of data
>losses -- for details see especially chapter 4.17 in Physical Layer
>Simplified Specification 6.0)

For my raspi-like hosts I avoid to buy A2 cards. With my A1 sdxc cards I
have no problems (neither with a built-in card reader nor an USB card
reader).

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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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