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Unlocking the additional space on a fx-CG50AU

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Calculators: Casio fx-CG50, Casio Classpad fx-CP400

Unlocking the additional space on a fx-CG50AU

Postby MajesticFalcon35 » Mon Jul 13, 2020 1:44 pm

As I live in Australia, I have the fx-CG50AU. It's basically identical to the normal CG50, but it has 4MB of storage rather than 16MB, to comply with SACE regulations.
I assumed that the memory was just a smaller chip, but I connected it to my laptop the other day and looked at it through Windows Disk Management, just for kicks. Lo and behold, the additional 12MB was present, but unpartitioned. https://imgur.com/a/UyJ0jmF

Attempting to expand the storage through Windows caused a file system error on the calculator, which was expected. Does anyone have any ideas on how to access this 12 MB of storage for storage?

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Calculators: Casio fx-7400GII (SH4), Casio fx-9750GII (SH4), Casio fx-9860GII SD, Casio Classpad 330, Casio fx-CG50, Casio Classpad fx-CP400

Re: Unlocking the additional space on a fx-CG50AU

Postby critor » Thu Jul 16, 2020 12:52 pm

Hi.

First thing to do would be to open your calculator and take a picture of its Flash NAND chip.

The fx-CG10/20/50 are using a 32MiB NAND, a Spansion S99-50272 :
Image
With a 16MiB partition reserved for the operating system (more than 12MiB big), and another 16MiB partition for storage.


The fx-CG50AU might be using a smaller 16MiB NAND, and the reported 16MiB availability would just be a software error.


By the way, any picture/capture of the file system error ? Thanks.

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Posts: 2
Joined: Mon Jul 13, 2020 1:35 pm
Calculators: Casio fx-CG50, Casio Classpad fx-CP400

Re: Unlocking the additional space on a fx-CG50AU

Postby MajesticFalcon35 » Mon Sep 28, 2020 5:02 am

critor wrote:Hi.

First thing to do would be to open your calculator and take a picture of its Flash NAND chip.

The fx-CG10/20/50 are using a 32MiB NAND, a Spansion S99-50272 :
Image
With a 16MiB partition reserved for the operating system (more than 12MiB big), and another 16MiB partition for storage.


The fx-CG50AU might be using a smaller 16MiB NAND, and the reported 16MiB availability would just be a software error.


By the way, any picture/capture of the file system error ? Thanks.


Sorry that it's been a while, I forgot I ended up making this post. I reformatted my calculator through Windows Disk Management to reproduce the file system error, it's shown here: https://imgur.com/a/vu1EZoi
I pulled the back off to get a look at it's specific internals, shown here: https://imgur.com/a/MFwW16Y
The NAND in the FX-CG50 AU is also a Spanison S99-50272, the same type of chip as seen in the standard FX-CG50. This likely means that there is genuinely another 12MB on the chip that is set to not be available to the user.

I admit that what I'm looking for is probably pretty difficult, but any help at all is appreciated. Thanks!

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