How long could a memory card last?
In a flash card, all the data is stored on a tiny chip. The chip’s memory (called flash memory) is based on a set of cells that are insulated from each other to prevent the charge leaking away. There are Single Layer Cell (SLC), Multi-Layer Cell (MLC), Triple Layer Cell (TLC), or Quad-Layer Cell (QLC) chip types, depending on the number of bits one cell can store (1, 2, 3, and 4, respectively). The more bits each cell holds, the more susceptible to failure the chip is. Thus, the endurance of an SLC flash memory is ten times greater in comparison to MLC and twenty times higher compared to TLC.
The problem is that every time some data is written to the chip, the insulation between the cells gets eroded and over time that may make the voltage in a cell change slightly and subsequently cause data corruption. Most modern flash memory cards are designed to detect and prevent such issues, but after a while there might be too many to get rid of all of them.
The exact lifespan of a memory card depends on a number of factors. If you use it frequently (for example, twice or more times a week), you’d better replace it once a year before the first signs of data corruption occur. And please notice that the shelf life of the majority of flash cards is 5 years or so.
What could cause data loss from a flash memory card?
Flash cards are solid-state devices, meaning they have no moving parts (unlike hard drives with spindles and heads). So, they are less vulnerable to mechanical shocks, vibrations, high humidity and temperature change. Yet, that doesn’t mean they never get damaged or corrupted, or lose data. Some of the most common causes of data loss from a flash card are:
- accidental data deletion or card formatting;
- mechanical damages (immersion in water, dropping from a height, etc.);
- sudden power outage (might occur in case you take pictures or record a video when the camera’s battery is low or getting low);
- file system corruption;
- bad usage habits (removing a card before the data transfer is finished, improper ejection from a card reader, using the same card on multiple devices);
- virus infection.
It’s always better to prevent data loss than to solve this problem afterwards. So, if you’d like to avoid the previously mentioned issues, please:
- eject your card safely: if you pull it out of the card reader when it is still being accessed, the data it stores may become corrupted or disappear. So, before you remove a card from a smartphone, tablet, camera or other gadget, please switch it off. Or use the Eject function, if your device has it;
- format new memory cards before using them: this helps to minimize the risk of data corruption. We recommend that you format a new flash card on the device you are going to use it in to assure their file systems are absolutely compatible;
- avoid using the same flash card in multiple devices, even if they are of the same brand. At least, don’t do it without reformatting a card. Different gadgets usually have different file systems and sometimes they might be incompatible with one another. If you use a memory card in a device with an incompatible file system, that might lead to data corruption.
Finally, don't forget to back up the data you store on a memory card. And please don't waste precious time trying to fix a card by yourself, if it has been damaged physically. Instead, you’d better take it to the nearest data recovery center.
What are the chances to restore data from a memory card?
In general, the chances to restore files after quick formatting or accidental deletion are quite high. Luckily, almost no information is permanently lost after being logically deleted from a memory card. At least, until it's replaced with new data. Data recovery programs can help you restore files in case their loss has a "logical" nature. In other words, when they have been deleted accidentally, or when a card has been formatted by mistake or its file system has become corrupt. However, the success of the recovery is subject to many factors, starting from the card’s file system type and ending with the user’s behavior after data loss detection.
The majority of modern memory cards use FAT32 or exFAT. Neither of these file systems completely erases data after a quick format or file deletion. Nevertheless, in some cases, the data may be recovered only partially due to severe file system fragmentation. Restored files may also lose their original names – particularly with FAT32, when they are longer than 8 characters. Some devices may also use proprietary file system variants (for example, in cameras, surveillance systems and car DVRs), which can further complicate data reconstruction.
More severe obstacles may arise with memory cards that have advanced controllers, which perform internal operations affecting deleted data. These operations may include moving data to balance wear, cleaning up unused blocks or reorganizing storage after formatting. In addition, certain devices, like digital cameras, may zero out blocks on the memory card even after a quick format, actively overwriting the previously used space. While these features improve performance and extend the card’s lifespan, they can erase deleted files, making recovery absolutely impossible. However, it is important to note that this type of aggressive behavior is generally not so common on standard memory cards..
To maximize the chances of successful memory card recovery, it is important to act carefully and follow a few basic precautions:
Stop using the card immediately once you notice data loss. Continued use can overwrite the files you’re willing to recover.
Avoid fixing any errors on the card before data recovery. Formatting the storage or running system repair utilities will reduce the recovery chances.
Connect the card directly to your computer. For proper access during data recovery, you should use an internal slot of your PC or a reliable external card reader rather than connecting through a camera, smartphone or other device.
Do not save the recovered files back to the same card. Always choose a different storage device to avoid accidental overwriting.
Do not attempt to repair a memory card that has been physically damaged (broken connector, controller failure, water damage, etc.). In such cases, professional in-lab recovery is the safest approach.
These simple rules will help to preserve the current state of the memory card and improve the likelihood of restoring lost data. To achieve the best possible outcome, you may also consider using professional data recovery software from SysDev Laboratories. Designed to handle a wide range of file systems and storage types, the software includes advanced scanning and reconstruction capabilities, enabling reliable recovery of lost files from flash memory cards even in challenging situations.