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I just found the 16GB Transcend wifi SD card I had been looking for. I plan to try that on my K1. I hope it stays powered up so I can SSH into it (hacked firmware in the SD card), then use a pair of lock-free queue files on SD flash to tunnel TC/IP traffic between the K1 and host PC.
It is important to be very careful when writing to a filesystem like FAT32 from two sides that are unaware of each other (why kindles unmount userstore partition before sharing it with the host PC). However, it can be done safely if you stay within safety constraints (write only to existing files with no new allocations, disk syncs, etc). My lock-free queues just need to use pre-allocated files and all should be fine.
The important thing is that the K1 not power down the SD card while I am trying to use it.
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