Re-formatting an unrecognised SD card

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#1
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I have several microSD cards that have been corrupted.   (probably by me)

They are not recognised as disks.

 

I don't care about losing the data.   I would just like to recover them for continued use.

 

I have Windows7 and Windows10.  

 

I guess that everything would be easy with Linux but I can't be bothered to install Linux just for this job.

 

David.

Last Edited: Tue. May 14, 2019 - 04:11 PM
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I have had the same problem and the only solution I have is to use my Mac Mini's Disk utilities.  Works like a champ every time.

 

Jim

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

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Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB user

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SD Association has a formatter :

https://www.avrfreaks.net/forum/fatfs-and-disk-removal#comment-2645466

...

Using this can sometimes recover bricked SD cards.

...

Hopefully the PC's SD controller will recognize the SD card's controller.

 

edit : quote

 

 

"Dare to be naïve." - Buckminster Fuller

Last Edited: Tue. May 14, 2019 - 04:19 PM
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david.prentice wrote:
...  but I can't be bothered to install Linux just for this job.
Likely is the "Live" instance of your preferred Linux distribution (on DVD or USB drive)

edit : https://www.osdisc.com/products/linux/usb/64bit/live/systemutilities

 

 

"Dare to be naïve." - Buckminster Fuller

Last Edited: Tue. May 14, 2019 - 04:28 PM
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David,

 

Were you able to recover the SD cards?  If so, what worked?

 

Alan

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No.   When I saw that a new message had been posted,   I hoped that this was going to be a solution.

 

There must be lots of Windows Users with damaged SD cards.

I am sure that there is a simple procedure.

 

David.

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Can you see it in Windows Disk Management?

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Are they recognized by SD Formatter?

 

One of the options is to completely over-write before formatting. I presume this includes the FAT. If so, then it has to recreate all that from scratch. Question is: can it do that on a card that it does not recognize as a valid "disk" at the start.

 

Jim

Jim Wagner Oregon Research Electronics, Consulting Div. Tangent, OR, USA http://www.orelectronics.net

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Are you attempting to re-format using one of those USB universal memory card contraptions ? I've found they can be quite iffy when formatting cards, whereas the built-in SD Card slot on my Dell laptop works perfectly.

 

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The question is, is he using Disk Management?   If the thing is corrupted it probably won't show up in File Explorer.  File Explorer only shows partitions that have drive letters.

Last Edited: Sat. May 18, 2019 - 07:28 PM
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N.Winterbottom wrote:
... whereas the built-in SD Card slot on my Dell laptop works perfectly.
Realtek Memory Card Reader Driver | Driver Details | Dell US

Card Reader Controllers - REALTEK

 

edit : an alternate way is via the SoC's SD controller (Raspberry Pi)

BCM2835 ARM Peripherals

(page 65)

5 External Mass Media Controller

...

edit2 : A20-OLinuXino-LIME2-UM.pdf (page 26, 6.2 MicroSD card connector) via A20-OLinuXino-LIME2 - Open Source Hardware Board

 

"Dare to be naïve." - Buckminster Fuller

Last Edited: Sat. May 18, 2019 - 10:26 PM
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I had some USB memory sticks that were showing similar signs of death. It was actually some utility from hp.com that resurrected them. Long time ago though, cant remember other details.

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Are all you guys using alien software telling me that Disk Management wouldn't fix the problem, or maybe you think it's too easy?

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I don't use windows but when I googled I came up with "DISKPART" command.

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steve17 wrote:

Are all you guys using alien software telling me that Disk Management wouldn't fix the problem, or maybe you think it's too easy?

yeah we're talking about memory devices that have got into such a confused state that a normal format won't fix them. They need a special kind of "internal" format that the standard tools in Windows and Linux know nothing about.

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Bill Greiman has written an example sketch that he provides with his Arduino SdFat.h library.

 

This displays the configuration details of the Card controller

As well as the Filesystem that might be installed on Partitions in the Master Boot Record.

 

This gives clues as to why the O.S. does not recognise the SD card as an "external device"

 

Having wasted a bit of time attempting to write my own "Sdinfo" utility I feel at little foolish.   The sketch was already on my PC !!

 

I have one microSD that will not even talk to the disk controller.   I regard this as beyond repair.

Other SDs have some "unlikely" configurations.   These might be recoverable.

 

I have not attempted anything yet.   I will leave that to another day.

There is also a SdFormatter sketch.

 

David.

 

 

Last Edited: Sun. May 19, 2019 - 05:07 PM