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I am unsure as to whether to ask here, or on software recommendations.

I have a box full of micro SD cards, which I have used over the years for Raspberry Pis. I was searching through them for one to use, and most seemed to be unrecognized.

I am not even sure how an SD card can go wrong, let alone 6 or 8 from a box of 10. Of course, it is possible that I recognized them as defective, but kept them "just in case".

Should I just through them away, or is there any way to rescue them?

Please note that I am not concerned with their current contents.

Mawg says reinstate Monica
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    Were they formatted with some arbitrary file system? Are you able re-format them, or can you not get that far? – spikey_richie May 13 '20 at 10:42
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    Have you tried cleaning the contacts and inserting them into something that understands EXT3 etc? – RedGrittyBrick May 13 '20 at 10:45
  • @spikey_richie They were formatted for Raspberry Pi, so are a mix of Linux file systems and FAT. There is an an image at http://www.simplyembedded.org/archives/filesystems-with-the-raspberry-pi/ – Mawg says reinstate Monica May 13 '20 at 12:19
  • @ Mokuba from the titles, none of those "duplicates" are applicable to my question. Obviously, if a moderator recommends them, I have to think that there is something in those questions which is pertinent to me. I read them, and could't find it (I am a mawg of very little brain). Could you please tell me what you found in those questions that could help me (and which I obviously missed)? Thanks – Mawg says reinstate Monica May 13 '20 at 12:29

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If you mean that you can't format those SD cards to reuse on your PC or other devices, I suggest you connect those SD cards via RAM Reader one by one, Then fix them using with Storage management like EaseUS Partition Master 12.0.
First wipe data, and then format as FAT32 to use it on any devices.

Reza Paidar
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