Recover Data from Card that cannnot be read

You could try pressing the card together (in case it came a little loose?) and maybe cleaning the contacts with a little bit of isopropanol on a swab. But I really wouldn't expect any results, and at best you might manage to read some of the data off before it dies again. I would not recommend opening it up under any circumstances - that will not help recovery any, and it will likely cause further damage.

You could also try various alternative readers - if you manage to find one that can at least expose the card as a block device, then you can take an image of the data (while recovering useful data from an image of damaged media is a whole other exercise - it's still better than where you are now).

Sometimes, there just isn't anything that can be done. If the data is very important, you could consider professional data recovery services (do they even exist for SD cards?), but they'd be very expensive. Otherwise, she might just have to accept the loss and try to recreate what she can.

When a storage device becomes physically unreadable, undetectable even, you can't go through the normal home data recovery steps (take image, scan for what files you can, etc.). With a mechanical drive, at least common failure modes are partial, so you can at least read something. With the nature of NAND storage, I can think of three possibilities:

You've lost the controller. The flash chip itself might still be readable, but reassembling the data from it will be a long and arduous task. This is not doable at home, and requires expensive, professional tools and expertise. (If you had the equipment to solder tiny chips ^(source) and read NAND flash, I suppose you could attempt this yourself, but you're more likely to accidentally destroy it.)
You've lost the flash chip itself. In this case, I don't think there's anything you or anyone else can do. It would be even harder to recover than a lost controller.
The card is physically damaged, but the controller and flash memory are intact. This is probably the best you can hope for. Again, with how small and fragile the card is, there isn't much you can do at home - but the chance of professional recovery is far higher.

The problem with all these is they require very expensive and still uncertain services to even attempt a recovery. Is the data worth that much?

Perhaps the best thing to do is to treat this as a lesson on backups - always have at least one extra copy of any data you can't afford to lose. The more important it is, the more copies you want, stored separately from each other.

Bob

Posted 2014-12-23T05:57:18.170

Reputation: 51 526

39Thanks. She took your advice and tried squeezing it between her fingers. Unfortunately, it didn't help (but didn't hurt!). Wait... Wait... Wait... she just did it again, and Windows is recognizing the card!!!!!!!! Tears of joy!!! Now we can celebrate two miracles on Channukah!!! Thank you!!! Shalom!!! – RockPaperLizard – 2014-12-23T08:19:56.710

18Good news! Now go buy another SD card and throw the damaged one away, not worth risking that again. – Robin Whittleton – 2014-12-23T09:14:17.167

I'm perplexed as to how squeezing the card works... just to make the internal contacts touch better? – h.j.k. – 2014-12-23T09:48:54.310

9@h.j.k. If there's any poor solder joints, for example, squeezing can get them to temporarily reconnect. This is a very temporary thing - evacuate your data and never use that card again. – Bob – 2014-12-23T10:23:33.353

6It never would have occurred to me to try to squeeze the data out like this. Wow. Will wonders never cease? – BrianH – 2014-12-23T15:40:17.700

@Bob, I guessed as much, thanks for the confirmation. – h.j.k. – 2014-12-23T16:45:58.103

8+1 for "Perhaps the best thing to do is to treat this as a lesson on backups". – Guntram Blohm supports Monica – 2014-12-23T17:07:51.583

@Robin - he ought to buy two new SD cards to replace the bad one so he can keep a backup copy of the data. – Johnny – 2014-12-23T19:39:47.853

Could you post a screenshot of what you see in the Disk Management control panel when the card is inserted in the card reader? If you see the full size disk but the partition is missing you might be able to use TestDisk to try and recover the partition or data.

– Mokubai – 2014-12-23T07:03:11.753

7@Mokubai The "blank or unsupported" from the phone is promising, but the "insert disk" is not. That's why the first step is to find a reader that can detect it - then there may be a chance. Always take an image, e.g. with ddrescue, before trying other recovery operations - don't squander what might be the one chance to get data off it. Then just follow standard HDD recovery procedures from the dd image. I might write up more later, but it'd echo existing HDD data recovery questions. – Bob – 2014-12-23T07:17:51.760

@bob good point. I have a couple of modern computers that have inbuilt card readers that can't understand new SD cards but my laptop can read them. Finding a machine that can detect the SD card at all is the first step. – Mokubai – 2014-12-23T07:25:33.843

If the data is very important, I think it is possible to dismount the SD card, get chips from inside, mount them on other card of the same model and read the information. But this can be made by company or skilled specialist, not by everybody. – i486 – 2014-12-23T10:33:07.280

@i486 If the card is indeed a microSD card, there really isn't any "inside" as much as there is an epoxy coating around bare chips and a thin interposer layer with interconnect and the gold pads. Washing the epoxy off is not something easy to do in a way that will leave the chips functional, even given all the right tools and chemicals.

– RBerteig – 2014-12-24T02:25:46.973

Recover Data from Card that cannnot be read

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