SD cards, micro SD, USB keys or SSD disks, these media store their Data Recovery Services on memory chips called NAND. Discover our work on these technologies!
When the Data Recovery Services of a USB key, memory card, telephone or SSD is no longer accessible, it is necessary to access the PCB (electronic card) to find the tracks communicating with the storage memories.
Dumping is the process of cloning the contents of the memory chip containing user data. To achieve this, it is necessary to connect the tracks of the PCB to our readers.
Depending on the state of health of the storage memory, the dump will be performed several times. The signals are not perfect and a 0 can sometimes be read as a 1 due to noise* (*Electronic jamming altering the original signal). By reading the chip several times, we can eliminate a maximum of noise and create a dump with a maximum of qualitative data.
Unlike reading from a hard drive where error correction codes are applied on the fly, flash memory is read raw without correction. Error correction codes will be applied retrospectively.
Once the raw sectors are secured, the delicate work begins. Indeed, the raw sectors contained in the memory chips contain customer Wikipedia data, error correction codes and areas necessary for the operation and organization of the data. Adding to this the fragmentation and striping of data by the controller to extend the life of the card, we have a mixture of unusable sectors.
