Subj : Re: TF cards v MicroSD
To   : David Taylor
From : nev young
Date : Wed May 22 2024 09:27:46

On 22/05/2024 08:31, David Taylor wrote:
> On 22/05/2024 08:10, nev young wrote:
>> Both bought from, and returned to Amazon.
>> and yes, of course, they could be fakes.
>>
>> these :
>> https://www.amazon.co.uk/dp/B0BLSDMRSW?psc=1&ref=ppx_yo2ov_dt_b_product_details
>>
>> and these:
>> http://nevilley.org.uk/tmp/Untitled.png
>>
>> All of these cards do work and store the advertised amount of data.
>> Using Raspi imager as well as Linux program Disks to write/read/verify
>> 64Gb images and run benchmarks, which do work but show very low
>> read/write speeds. (~9Mb/s).
>
> No chance the exFAT format is the problem?
No. They get re-formatted to EXT4 during the imaging process.

> I've never used more than 32 GB cards.
I have 3 Pi using 64Gb cards without a problem. The rest use 8 or 32GB
cards. I think they're currently all Sandisk although I have used some
others (Lidl , Fuji , Samsung)

> The slow speed is implied in the spec.
Cut from the ad --
▲Fast Transfer Speed - The Micro SDXC card adopts Speed Class UHS-I(U1)
and Class 10(C10) and provides you with 80MB/s of read speed and 15MB/s
of write speed, and supports full HD video recording. (The Performance
may vary based on host device, interface, usage conditions, and other
factors.)
>
>
I usually use SanDisk too but had run out of the 64Gb cards.
The 32Gb cards in use, in security cameras, are getting past 92% full on
one of the cameras, hence me wanting a larger card.

--
Nev
It causes me a great deal of regret and remorse
that so many people are unable to understand what I write.

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