When purchasing microSD cards, you'll probably notice two types: SDHC and SDXC. SDHC stands for Secure Digital High Capacity. SDHC cards have a capacity of 2GB to 32GB and are often preformatted with the FAT32 file system. Alternatively, SDXC cards, which stands for Secure Digital eXtended Capacity, adopt Microsoft's exFAT file system and can range from 32GB to 2TB in capacity. Keep in mind that not every Android device supports microSD cards and remember to check the supported maximum capacity for microSD cards on your Android device.
Another important feature of a microSD card is the speed. microSD card speed is customarily rated by its sequential read or write speed. The sequential performance aspect is the most relevant for storing and retrieving large files, such as images and multimedia. For mobile devices, there are three common speed classes: Class 10, UHS-I Class 1 (U1), and UHS-I Class 3 (U3). UHS stands for Ultra High Speed, and currently has two bus types, labeled I and II. UHS-II has physically more pins but is backwards compatible to UHS-I and non-UHS for both slot and card. Class 10 and UHS-I U1 cards have a minimum read/write speed of 10MB/S and are capable of Full HD (1080p) video recording and consecutive recording of HD stills and real-time broadcasting. UHS-I U3 can support 4K video files at 60/120 fps. The specifications of a microSD card are labeled on its surface as shown in below example.
(An SDHC UHS-I Class 1 card with a storage capacity of 32GB)
Unlike built-in storage, many memory cards are designed with portability in mind and can be removed and accessed on other devices. The plug in and out makes memory cards prone to damage and potential data loss. You might also have experienced accidental deletion or formatting that costs you all the important files stored on the microSD cards. To fix a microSD card or to recover files accidentally deleted, you'll need a computer and a card reader.
microSD cards Errors
If you receive error messages like "The file or directory is corrupted or unreadable" or "Disk in drive X:\ is not formatted. Do you want to format it now?" when you connect your SD card to the computer, it means your SD card is faulty. We can run a simple command to try to fix it.
1. Insert your memory card into a USB memory card adapter. Plug the USB adapter into a USB port on your computer. Windows automatically recognizes the device and assigns a drive letter to it.
2. Go to the start menu, type in cmd in a search bar, hit enter and then you can see cmd. exe listed. You can also press Windows key + R to quick access the Command Prompt.
3. Type in "chkdsk drive_letter: /r" (quotes not included). For example, if "H" is assigned to your memory card, type "chkdsk h: /r".
4. Wait until the "chkdsk" program finishes checking your memory card for structure corruption. When it is done, you're prompted to save lost chains into files. Click the “Yes” option. In a few moments, "chkdsk" will display all of your lost data files that have been repaired on your computer.
5. Exit to Desktop and enter Computer. Double click on the memory card drive letter to check if it has been successfully fixed.
Recover files from Deletion or Formatting
As long as you haven't specifically erased your microSD card, we can attempt to recover the lost files using 3rd party utilities such as H Data Recovery Software. H Data file recovery is a fully-featured data recovery software that could recover lost files in most data loss situations, including microSD cards and other portable flash memory devices. Here is how to do it:
1. Install and launch H Data Recovery Software.
2. Insert the memory card into a USB card adapter and plug your card adapter into your computer. Select the Flash Memory Recovery module by clicking it. The software will automatically detect all the flash memory cards currently connected to this computer. Choose your memory card and click Next.
3. H Data Recovery will scan the memory card file system and try to find and reconstitute the files. When the scan is complete, you will be able to see the list of all recoverable files. If you act quick enough after the format, the chance of a complete recovery is very high.
4. Select all the files you want to restore, and click the Next button. Choose a directory that you want to restore these files to.
Deleted files can be overwritten by new files so it is important that you perform the data recovery with the right tool as soon as you can. Also, when choosing the directory to put your recovered files during the recovery, do not store these files directly on your microSD card in order to avoid other unrecovered files being overwritten.
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