Subj : Re: TF cards v MicroSD To : All From : Nikolaj Lazic Date : Thu Jun 06 2024 14:31:50 Dana 22 May 2024 18:21:14 +0100 (BST), Theo napis'o: > nev young wrote: >> On 20/05/2024 17:37, Theo wrote: >> > Knute Johnson 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. you can test the card with "badblocks -o /report -t random -swv /dev/your_sd" and see the report. Then "cp /dev/zero /dev/your_sd" and ctrl+c after few seconds to make clean space for partition table. > > Theo --- SoupGate-Win32 v1.05 * Origin: Agency HUB, Dunedin - New Zealand | Fido<>Usenet Gateway (3:770/3) .