A client brought a USB flash drive A-Data for recovery of information. At the try of disc access the system creates a message about absence of access to the disc and proposes to start the formatting procedure.
The flash drive itself is designed unusually; it is necessary to turn a case part clockwise to draw the USB contacts out of the case. Such a failure, having such signs can be due to two reasons - either a logical failure of USB flash drive file system, or a carrier physical fault.
USB flash drive Adata
Drawn out contacts
If the flash drive failed, data recovery can be done only with hardware repair. I need to dismantle flash drive, unsolder memory chips and read their content with the help of programmer, and then arrange the dump logicality.
"Physical" access to the drive distinguishes a logical fault from a physical one, if we use third part utilities, for example, WinHEX instead of standard OS means. If such a utility gets access to all the working area of the drive, it is necessary to take a dump off and start logical analysis.
In my case a virus destroyed one of two FAT copies on the drive. For data recovery I have to make a detailed analysis of all the first copy remainder and compare it with the second copy to create a correct virtual FS.