r/sdcard

which one is more compatible to samsung tab a9? also planning to move some of my apps to sdcard storage...

I am on a Xiaomi phone and in the MicroSD Storage I clicked Format SD card by mistake. There is any way I can recover my data?

I have never seen this in my decades of computer use. It is a bit unsettling, because I was trying to wipe personal data, but it kept on magically re-appearing, even after power cycles! Please read if you're interested and let me know if you have a way of explaining this, or have experienced the same.

The device: a 16 GB Samsung SD-card, that has been in my IP-camera for a while (months to >1 year). It had apparantly been recording continually for an unknown amount of time, this wasn't my intention and happened inadvertently. Eventually it stopped. It wasn't entirely full, so I'm not sure if it looped like a dashcam for a long time or whatever happened exactly. In any way, it was full of video files, each the same in duration.

Because it had been recording my house interior unintentionally, I saw myself walking in the house, to and from the shower, etc. You can imagine I wanted to destroy this data in a good way, so I decided to delete it, then fill the SD-card with random data, and then delete that.

This is what I did and how:

Sequence of action:

1. Insert and mount the SD card
2. The original CCTV files are present and readable
3. Delete files and create new files on the SD-card. All operations report success. No errors in the terminal, Dolphin, or `dmesg`
4. Newly written files can be seen and read normally with `ls`, `cat`, Dolphin file manager
5. Perform sync and unmount
6. Physically remove the SD card, wait a bit
7. Reinsert and mount
8. The card is back in exactly its old state. Newly created files are gone... and the original, old IP camera files magically re-appeared..!

I repeated this, a few things, but replaced step 3:

• (Run 1): I wrote multiple 4 GB files with `dd`, until it returned a "disk full" error.
• (Run 2): with KDE Partition Manager's option to Shred the FAT filesystem. It took a bit over a minute, but it finished and displayed no error messages.
• (Run 3,4,5): Skipped deleting files, and only wrote a small text file with the exact current date & time and a small test message in it, and reproduced this (view it in Dolphin, KDE's file manager, or by using `cat`).

Performed on 2 setups:

• (Runs 1,2,3): Fedora 44 KDE desktop, using a USB SD-card reader
• (Run 4,5): Old laptop booted from a SystemRescue USB stick, using its built-in SD-card reader via a passive microSD-to-SD adapter

SD card data:

• bought between 2015-2020
• Samsung Evo microSDHC, model no. MB-MP16D
• yes, it's old, and it's not meant for 24/7 operation like CCTV

Note:

• lsblk reported the device as writable (RO=0)
• kernel reported no write errors, I/O errors, resets, or write-protect condition

The SD card is now physically destroyed.

Really wondering if this is a common thing: a flash device that accepts writes and deletes, even FAT filesystem table shreds, but never writes them; and also reverts to its previous state after power loss? It makes me uncomfortable because this seems to imply there's basically no way of confirming a NAND drive has actually wiped files, unless goes through a power cycle (physically removing and re-inserting) and is actively checked again after..?

Okay this is going to be a long one. But your help is appreciated.

The issue is with a Lexar Professional 256 GB V90 SDXC Card. I was offloading footage from my camera, a Canon C80, and I went to eject the card when it was finished but by accident I ejected the subfolder that contains the footage, subfolder was titled "Reel_0008". Card was titled "CanonA_0008". Thought it was just an oops and ejected the primary folder of the card and then went and shot more footage on the card today. Went to offload that footage and found that the camera renamed the card "CanonA_0009" and the folder that contains the footage from today is called "Reel_0009". I can see the storage capacity of the card still reflects that the other footage is there, but it's not visible.

I've tried running Disk Utility (on a Mac) and doing first aid on both the card and the subsequent volume inside of the card "CanonA_0009" and the other folder won't come back. I've tried revealing hidden files, I've tried restarting the computer, I've tried renaming the card back to "CanonA_0008" and then ejecting it and plugging it back in and nothing has worked yet.

The footage from the first day is offloaded and on 2 separate drives, so I should be fine, but I just want to ensure that if something goes wrong with my computer before that project is done that I still have the original files.

It seems that the pathway to the files is what's broken, so if someone is smarter than me and knows how to fix that I would appreciate it!

Bought a 128gb microsd card off of taobao, are they a reliable brand? How do they compare to sandisk, which is typically more expensive

So for some reason when I insert my sd card into my reader it will get detected for like 3 seconds then not anymore and when I insert it into my 3ds it wont get read either. Is there a way to somehow get the data and transfer it into another sd card or is that data now forever gone? Ik it ain't the reader ir the 3ds because when I insert a different sd card it will be read.

I just got two high endurance microsd cards from B&H Photo. I’m 3 for 3 in getting counterfeits of this same card from Amazon, so I’m hoping these are legit, direct from B&H, not third party, supposedly.

I’ve used F3 (Mac) to test the capacities of other cards, but I’m assuming there’s no other test I can perform to verify these are real endurance cards. is that all I can do?

Hi everyone!

I used to have a nice SD card reader Ugreen but i currently lost it. Ordered another one online and guess what, it doesn’t read my sd cards at all, the “import” part doesnt even pop up on my photos app.

Can you recommend me another sd card reader that connects directly to apple s photos? I had another one that required another app and it was infuriating that i had to download pictures one by one.

I have an SD Card that I want to format but when I do it, it says that Windows is unable to do it. Disk Management shows it as healthy. When I delete its content, they reappear after reinserting. I don't know what else to add lol

Any ideas on what's going on and how to format it?

Thank you!

No matter what i try, i can't fix my Micro SD

I can't format it with the disk manager as it just fails inmediatly

Diskpart doesn't work, i put clean, attributes disk clear reandonly, and i can't still format it

I don't care about the content, there is nothing important, i just want my SD to work!