ADMA (Advanced Direct Memory Access) is a driver for managing communication between your computer and the SD (Secure Digital) card. This mechanism allows you to transfer data quickly and easily. However, in some situations, using these settings can damage your memory card and lead to critical data loss situations. In such circumstances, you must opt ​​for SD card recovery solutions to get back your valuable data.

Consider the following scenario

You have an SD card, which is formatted with the NTFS file system. You use ADMA to transfer data between your memory card and the computer, which is running Microsoft Windows 7. However, while transferring data through this method, the logical structure of the memory card and the data on the card may become corrupted. Furthermore, unexpected problems can also occur when you try to use the memory card or corrupted data.

Reasons for the problem

During the advanced direct memory access transfer process, Sdbus.sys (Secure Digital Bus Driver) converts the DMA metadata structure of the Windows 7 operating system into the ADMA metadata structure of the SD card. The ADMA and DMA metadata structures are also called descriptor tables. The descriptor table contains a buffer address and a data length value.

The maximum size of the data length field is 64 KB (kilobytes) and its value is 16 bits. However, when the data conversion procedure continues, the Sdbus.sys drive does not check the buffer size in the descriptor table of your Windows 7 system. Therefore, the Secure Digital bus driver may set a data length incorrect in the SD descriptor table. For example, the Sdbus.sys drive can set a data length greater than 0xFFFF. In this scenario, I / O errors may also occur. All of this behavior leads to serious data loss situations.

Solution

To avoid such situations and the need for SD card recovery, Microsoft provided an update to fix memory card corruption issues in Windows 7. But if your data has already been lost, you need to restore it from the latest version. .

In case the back is out of date or not available at all, the SD card recovery software is required. The apps methodically scan the entire SD card using high-end scanning algorithms and extract all the lost photos, songs, and videos. SD card file recovery applications have a self-describing user interface for ease of use. With read-only and non-destructive behavior, these applications are completely safe to use.

Stellar Phoenix Photo Recovery (Windows) is a comprehensive application to ensure successful recovery of all lost photos. The software works well with Microsoft Windows 7, Vista, XP, 2000 and NT. It is compatible with major cameras such as Nikon, Canon, Kodak, Sony, Fuji, and Olympus.

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