Although most file system and kernel issues can be fixed by booting to the second kernel (krnB) or using the script to restore factory settings it is possible to cripple the SD card.  When you first get the board, lift and pull out the microSD card and use windiskimager32 to read and save the image.   This also is a cool way to replace the original tiny card to a much larger card and increase the sizes of the partitions, save off a milestone of a project or even a hacked up version optimized to play quake on a TV.

This info is on the Chumby forums some place, but I though it was good to restate it here too.

I am running the Hacker board with a 4gig card with a kernel I built.  I've got access to sensors, Ethernet, displaying to TV, RTC battery and an ext3 formatted flash drive for native kernel builds.  Quake even mostly works.

What I've done is set up an Arduino as a http server which supports inline sensor tags.  These are commented tags hidden inside normal html files that the server hosts.   When a requested html file is returned it is parsed on the fly and any sensor tags are concatenated with the matching sensor data.

This allows the server to serve up pretty pages which abstract the complicated details of accessing the sensor.   The server can be visited like a local web server or the chumby can access it and use that data in it's widgets. 

The Arduino is not the worlds best http server, but as a simple http sensor server with limited connections, home cloud use is perfect.

Now on the chumby side a special get file request is sent to the server which returns the requested remote sensor or device data.  Data can be parsed from returning html files, since I leave in the original commented sensor tags with the data.  Files named to the sensor tag name simply return the sensor data text.

Sensor and other data devices then can be made generic and auto detectable by a Chumby on a local wireless network.

Chumby outside temp sensor, baby monitor, front door monitor, etc...  things useful at your bedside.

Thanks.

I put it on a card...  looks like the right one.

Thanks.

How does one remove the SD card from it's holder?  I wanted to replace the 500mb card with 1 gig or more, but it's in the reader pretty securely and I want to break anything.

I see...all this time I thought the chip moved when it was the metal that moved.  Thanks.