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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

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THE REAL DEAL R3 Data Recovery are Geniuses! I am almost speechless with what an incredible job you have done for me.

As a videographer my data is my life, You saved 1.2TB of footage and all of my projects from a 2TB portable hard drive that I dropped. As soon as it hit the floor I felt sick. I chose the emergency recovery which was worth every penny. A super competitive quote upfront that did not change through the recovery. I had a new drive back in 3 days with 100% recovery.

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To anyone feeling sick reading these reviews to make themselves feel better (trust me ive been there) watch R3’s video and know your data is in the safest place it can be with this lot.

Thank you xMillion!

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