Date: 2013-02-05 08:27 am (UTC) really you don't know what is inside a SD card.
Hard wiring the write pin is not the problem. Its the fuseable link in the flash chip or controller chip in most cases that has removed the means to write. Read mode from the controller would zero out the flash. So changing the write bit will not work.
Reality of SD cards particularly the smaller versions the flash and controller have a habit of being one chip.
Sorry write protected SD card done by CSR does require direct physical access to bipass. Even then with a lot of SD cards it will require advanced tools to break open the chip/chips to fix the burnt out fuse-able link on the silcon.
Some of the older SD cards had the fuseable link as a extra little bit between the controller chip and the flash those you could wire the pin around. Those have not been made for the past 3 years.
Read only SD card done correct is read only no simple bypass if you are starting with new current cards.
Power management, mobile and firmware developer on Linux. Security developer at Aurora. Ex-biologist. mjg59 on Twitter. Content here should not be interpreted as the opinion of my employer. Also on Mastodon.
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Re: Lot of chromebooks could be secured.
Date: 2013-02-06 08:21 am (UTC)Hard wiring the write pin is not the problem. Its the fuseable link in the flash chip or controller chip in most cases that has removed the means to write. Read mode from the controller would zero out the flash. So changing the write bit will not work.
Reality of SD cards particularly the smaller versions the flash and controller have a habit of being one chip.
Sorry write protected SD card done by CSR does require direct physical access to bipass. Even then with a lot of SD cards it will require advanced tools to break open the chip/chips to fix the burnt out fuse-able link on the silcon.
Some of the older SD cards had the fuseable link as a extra little bit between the controller chip and the flash those you could wire the pin around. Those have not been made for the past 3 years.
Read only SD card done correct is read only no simple bypass if you are starting with new current cards.