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Micro sdxc SD card many empty folders without video photo files, how to get back the video photo data inside
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I folder is named by date, I found that I inserted the computer to read when the date of the photo has been deleted in the empty folder still card did not show, please ask what can be done to recover these empty folders of files?
I even in the camera operation "delete all photos of the date", with usb connected to the computer will still have the date of the empty folder residue, you do not have this phenomenon? The camera will only delete the photo files by mistake, not the folder.
It may be that you often take out the sandisk sdxc SD card from the camera and connect to the computer, after the computer to delete some photos or move to the computer, so that the SD card will produce empty files, insert the Micro sdxc SD card into the camera, use the camera directly to delete the empty files can be. Clip residue, you do not have this phenomenon?
It may be that you often remove the SD card from the camera and connect it to the computer, after the computer to delete or move some photos to the computer, so the SD card will produce empty files, insert the sdxc SD card into the camera, use the camera to delete the empty folder directly.
Micro sdxc SD card is formatted? What do you mean? I still have a lot of video and photo data on the card, so I can't delete it, and I can't format it. I just want to store useful photos on the card without losing files.
A, micro sdxc SD memory card MBR and DBR basics
1, now the U disk, TF card, micro sdxc sd card, CF card, etc. capacity are larger, partition format is usually FAT32, FAT16 rarely (only some antique use).
2, micro sdxc sd card, U disk, TF card, SD card, CF card, etc. MBR sector (sector 0) generally has a partition table and 55AA mark (partition table knowledge is not repeated here), there may be boot code, there may be no boot code (with or without boot code does not affect data recovery);
3, micro sdxc sd card DBR sector 00-3F for 64 bytes of jump code, OEM logo, PBP parameters and volume label, etc., boot code may or may not be available (does not affect data recovery), the last two bytes are 55AA markers.
The following are the meanings of the bytes in the FAT32 file system.
4, sector 6 of the file system is DBR backup.
5, the partition table in the MBR is damaged or the DBR sector is damaged, both will show up in the system micro sdxc sd card prompt unformatted.
Second, micro sdxc sd card MBR and DBR file recovery methods
1. Make an image backup. If you are not familiar with the file system, in order to avoid making some wrong changes, you can first make a sector-level backup of the U disk, TF card, SD card, CF card, etc. that you need to recover, and then operate in the backup image file. Tools → Disk Tools → Clone Disk in Winhex to back up the storage media as a file (source select the storage media to be backed up and target a file).
2. open the backed up backup file in Winhex and set the image file to disk.
3. Check if there is a partition table and 55AA mark for the sector that will be MBR number. If so, locate the starting location of the partition and check if it is a DBR sector.
4, if there is no micro sdxc sd card partition table or partition table specified in the starting sector of the partition is not DBR, search for FAT32 DBR jump instruction EB5890 (set the condition to 512 = 0) or 55AA mark (set the condition to 512 = 510)
if the search to determine the DBR, skip steps 5-7. If not searched, continue with the following steps.
5. F8FFFF to find the sector numbers of FAT1 and FAT2, and use FAT2-FAT1 to derive the FAT table size value.
6. Copy the corresponding normal FAT32 file system DBR to any location between the MBR sector and the FAT1 start sector.
7. Modify the corresponding values in the DBR as follows.
8, write the partition table or modify the parameters in the partition table.
Third, use ImDisk virtual disk tool to load the disk with the image file, open the loaded disk letter, check whether the data is correct, if not, try to modify the "sector/cluster" value in DBR.
In fact, if the DBR of micro sdxc sd card is corrupted, it is a trouble to check and change one by one, you can write a script, set any sector as DBR sector before FAT1, let the script write a DBR for you automatically in that blind sector, change the starting sector number in the partition table to the sector number you set, it is very trouble-free and fast and accurate.
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