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

Broken Memory Stick - USB Data Recovery Services

USB memory sticks are a very convenient way of keeping your data close to you as you move from one place to another. Teachers/lecturers and students especially but anyone who moves from computer to computer need a way to keep their data with them. USB drives, memory sticks, pen drives (call them what you will), are a very convenient and easy way to keep your data with you while you move around.

Cloud storage is all good and well but USB sticks are just so easy to use. No installing of cloud storage apps, no waiting until the data syncs on a new PC you haven't used before, no logging into a web site... Plug and play - its just so convenient.

Simple though comes with its own dangers. USB devices are very much prone to failure that users are not advised of when they purchase them.

Snapped USB stick

The various components on the devices are very robust but they have weak points:

  • Physical damge - Where do we start?
  • The dog chewed my memory stick.
  • It snapped while it was plugged into my laptop.
  • I ran over it with my car.
  • We have seen them all.

Non-physical Damage

Sometimes these devices will just stop working, this is normally caused by an electronic component failure.

In most cases the controller chip fails, of course the device will not be useable and may behave in the following way:

  • It may show/register on your computer but not be accessible.
  • Not be detected on your computer at all.
  • Get very hot when you plug the device in.

Physical Damage

Physical damage is just that, it has been damaged by someone or something accidentally. It is also equally impossible to predict when the controller might fail but what isn't impossible is getting the data back, not for our engineers at R3.

If your device doesn't behave as it should contact our team of experts at 0800 999 3282. Our skilled professionals will be able to reliably recover data on your USB stick and provide industry-leading turnaround times which give you the confidence that's necessary to develop a solid, effective recovery plan.