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What Goes Into a Nand Read?

When a USB memory stick becomes unresponsive and a simple soldering iron repair doesn’t produce positive results then we have another recovery option called a nand read.

This method of recovery is very complex and involves several stages each very dependent on its proceeding stage.

Stage 1 is the removal of the nand chips. The number and style of nand chips varies with manufacturer, the chips must be unsoldered paying attention not to damage the delicate pins and then cleaned in an ultrasonic bath to remove flux residues.

Stage 2 is making dumps of the chip content. The data must be read from each nand chip, to be entered into software. This involves setting correct parameters for dump number, page sizes and any timings unique to the nand chip. This may have to be repeated if too many errors are detected at the end of the reading process and the settings tweaked.

Stage 3 involves reassembly of dumps. Once all the dumps are made they can be entered into software to start the long process of recreating what the microcontroller did when in charge on the USB device. Getting the data to line up within the dumps is a complex task involving a Xor pattern with many parameters to change that unfortunately isn’t automated. Once this process has been completed successfully the integrity of the data is checked and if good copied off... Stage 3 may have to be repeated several times to get good data.

If you'd like to learn more or speak directly with our engineers, please call us at 0800 999 3282

nand read

Posted In: Q&A | USB & Memory Stick

What Our Customers Say About Us

I have used R3 Data Recovery for the second time now in the last three years and have been exceptionally impressed from start to finish both times; from loosing all data from a failed usb memory stick to receiving an email stating all list of data had been recovered all within a few days.

Once I made the enquiry to R3 Data Recovery making them aware of my troubles; they organised the failed memory sticks collection by courier, got it back to their lab and got straight on with locating my lost data. On this second most recent occasion the file list was copied through to my email account following on with a file upload where I had difficulties installing and accessing the files to continue working on.

I made contact to a staff member called Andy at R3 data Recovery stating I had difficulties but after linking through the “Team Viewer” programme; in no time at all was my data file successfully uploaded and all files were accessible.

A true honest company that I will be strongly happy to recommend and would happily make contact with them if I face another major issue!

Thank you to all of you at R3 Data Recovery.

Leon R

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