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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

The inevitable happened and a CF card failed when I was filming a wedding. 3 companies told me the card had not recorded any info and that the footage was not recoverable. Someone mentioned R3 Data and I thought I’d give it one last attempt.

The service was second to none. They sent a courier to collect my card (the other companies had never physically seen my card) they kept me up to date with the process throughout and managed to return all the corrupt files intact. To be able to tell the bride all has been saved was a feeling I’ll never forget and I’ll happily use R3 again (thought hopefully not to soon).

Daniel Yates

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R3 Data Recovery Services are designed to meet the needs of businesses and home users requiring a fixed cost, highly successful data recovery solution.

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​If your hard drive happens to fail, contact our team of experts. Our skilled professionals will be able to reliably recover data on your hard drive and provide industry-leading turnaround times which give you the confidence that's necessary to develop a solid, effective recovery plan.


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