A small device that allows you to temporarily (or permanently) read-only-lock SD/MicroSD cardsDesigned by CRImier, Ships from Latvia
This device was developed by Karl Lunt back in 2013, then improved by Nephiel in 2014. I recently found out it was never sold or mass-manufactured and people are interested in it, so I've designed ...Read More…
This device was developed by Karl Lunt back in 2013, then improved by Nephiel in 2014. I recently found out it was never sold or mass-manufactured and people are interested in it, so I've designed a PCB, updated the firmware and assembled a couple of those.
Larger SD cards have this mechanical "write protect" slide switch on the side, that you can switch and the card reader can check. However, that switch is more useless than useful, since 1) not all readers support it 2) the OS can ignore it 3) it obviously doesn't apply to MicroSD cards 4) the switch tends to slide accidentally (or fall out of the SD card altogether) when you have no intention of enabling write protection.
There exists a much more reliable method to lock the SD cards - one this device is designed to use. The controller inside the card (both the large ones and the MicroSD ones) actually supports a command that locks the card into a read-only mode, preventing any changes - either temporarily (can be switched back to read-write) or even permanently (without a way to ever restore the write capability). This device has an ATTiny85 chip that controls the SD card, reading the lock status, showing it on the LED and allowing you to toggle it using the button. It supports both temporary and permanent SD card locking, too!
Each device is tested by me (on both SDSC and SDHC cards) before I send it out, and is designed so that you don't accidentally PERM-lock the card. Having taken these precautions, I am not liable for any SD cards you accidentally lock permanently, or any SD cards that may break as a result of using this device.
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