Cards are so cheap relative to cameras that there is no excuse not to follow the 'if in doubt, throw it out' mantra and then you can replace them with cards that do have a warranty. If cards fail it's normally the 'controller' that fails and it will be completely inaccessible. Have you ever lost data due to sd card corruption?
There are several ways in which an SD card can go bad.
Physical Damage
First, cards can be actually physically broken. You can bend them in half pretty easily if you try, but in general they're actually pretty resilient. Many are effectively water-proof even if not marketed that way. I've sent cards through the laundry, and once I dropped one full of precious baby photos right into hot coffee — no problem! Now, I wouldn't recommend pushing your luck, but if you're careful, this is unlikely.
Electrostatic discharge could also damage the electronics, although again most cards are surprisingly well-resistant. (Try to intentionally destroy a card with static and your success rate will be low.) Flash isn't particularly light-sensitive, so airport x-rays aren't a real risk (longer exposure to high-energy x-rays is another story). It's also surprisingly heat-resistant — the plastic housing is probably at more risk than the memory itsel.
Read more: Is it possible to recover data from physically damaged memory card
Filesystem and File Corruption
Physical damage is at the most basic level. At the higher end, you can have corruption and data loss without anything fundamentally going wrong. The firmware in cameras and card readers (that is, the mini-os and software that runs on the device) can make mistakes, or be caught in situations it can't handle.
The most obvious is that you can mess things up if you pull out the card while trying to write to it. Don't do that. (And remember that with caching, that can happen quite a while after you think the data transfer is done.) With SD or Compact Flash cards, it's usually reasonably safe to remove the card from a reader while it's mounted for read access; beware that if you happen to have an xD card device that this is not safe.
A bug could happen in deleting files, or if the card fills up. And, it's theoretically possible that if you format the card on a computer conflicting filesystem bugs will cause issues.
Presuming you avoid the yank-the-card-out scenario, and don't have a hardware failure, these are also pretty rare, because the filesystem implementations used in cameras have been around for a long time and are very well tested.
It's also possible that bad cables, bad USB ports, or problems in the computer itself could corrupt files on transfer. Trying again on another system is always a good first diagnostic.
In all of these cases, the card itself is really fine — reformat and you can use it again. If you want to recover corrupted sd card data, you can download SD Card Data recovery Software.
There are several ways in which an SD card can go bad.
Physical Damage
First, cards can be actually physically broken. You can bend them in half pretty easily if you try, but in general they're actually pretty resilient. Many are effectively water-proof even if not marketed that way. I've sent cards through the laundry, and once I dropped one full of precious baby photos right into hot coffee — no problem! Now, I wouldn't recommend pushing your luck, but if you're careful, this is unlikely.
Electrostatic discharge could also damage the electronics, although again most cards are surprisingly well-resistant. (Try to intentionally destroy a card with static and your success rate will be low.) Flash isn't particularly light-sensitive, so airport x-rays aren't a real risk (longer exposure to high-energy x-rays is another story). It's also surprisingly heat-resistant — the plastic housing is probably at more risk than the memory itsel.
Read more: Is it possible to recover data from physically damaged memory card
Filesystem and File Corruption
Physical damage is at the most basic level. At the higher end, you can have corruption and data loss without anything fundamentally going wrong. The firmware in cameras and card readers (that is, the mini-os and software that runs on the device) can make mistakes, or be caught in situations it can't handle.
The most obvious is that you can mess things up if you pull out the card while trying to write to it. Don't do that. (And remember that with caching, that can happen quite a while after you think the data transfer is done.) With SD or Compact Flash cards, it's usually reasonably safe to remove the card from a reader while it's mounted for read access; beware that if you happen to have an xD card device that this is not safe.
A bug could happen in deleting files, or if the card fills up. And, it's theoretically possible that if you format the card on a computer conflicting filesystem bugs will cause issues.
Presuming you avoid the yank-the-card-out scenario, and don't have a hardware failure, these are also pretty rare, because the filesystem implementations used in cameras have been around for a long time and are very well tested.
It's also possible that bad cables, bad USB ports, or problems in the computer itself could corrupt files on transfer. Trying again on another system is always a good first diagnostic.
In all of these cases, the card itself is really fine — reformat and you can use it again. If you want to recover corrupted sd card data, you can download SD Card Data recovery Software.
website: http://www.hdatarecovery.com/
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Recover Files From corrupted SD Card, USB Drive, Hard Drive
Q&A: Detect and retrieve inaccessible files from 4GB Micro SD Card
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[Solved]Can I recover deleted/formatted photos from my SD card?
Recovery accidentally lost 3 weeks of pictures from digital camera SD card