The vast majority of data loss cases where memory cards are involved (the ones used in cameras, smart phones, or music players) is of the logical variety.
Data loss occurs when it has been erased either by mistake or through the corruption of the file system used on the card. Similar to hard drives, these situations require you to stop using the card immediately to prevent any more data being written to it, as it could potentially overwrite the data one would like to recover. These logical errors have an excellent chance of having all the data recovered.
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