Subj : Re: TF cards v MicroSD
To   : nev young
From : Theo
Date : Wed May 22 2024 18:21:14

nev young <newsforpasiphae1953@yahoo.co.uk> wrote:
> On 20/05/2024 17:37, Theo wrote:
> > Knute Johnson <knute2024@585ranch.com> wrote:
> >> On 5/20/24 09:03, nev young wrote:
> >>> Wherever I look on the internet I read that there is no difference
> >>> between TF cards and MicroSD cards.
> >>>
> >>> But I have never been able to boot any of my various Pi using TF cards.
> >>> They just do not boot!
> >>
> >> https://www.makeuseof.com/what-is-a-tf-card/
> >
> Yup. seen all of that before.
> >
> > So TF == microSD.
>
> and yet they don't work! At least for me.
> Has anyone ever booted a Pi (of any sort) using a TF card?

There's no such thing as a TF card, aside from 20 year old ones.
MicroSD and TF are one and the same.

> > OP, what cards are you having problems with?  Where did you buy them from?
> > Any chances they are fakes?
> >
>
> 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

So you got 2x512GB for £20?  That sounds exceedingly dodgy.  Currently a
single Sandisk 512GB card is £40.

No idea about the 'Kootion' cards - but I'd stick to known brands, and avoid
those shipped by marketplace sellers.

> 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).

I'm not sure Raspi-imager will notice the card is fake.  It'll write the
1-4GB image it has to the card, and if the card has let's say an 8GB real
capacity then everything will go fine and it'll verify correctly.  But as
soon as you start using more of the card beyond the first 8GB - eg the first
time boot which resizes the partition to use the whole card - then it'll
start silently overwriting the OS.

Theo

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