I want to start my stream just after startup, so I created a file debugchumby in USB stick as:

#!/bin/sh
btplay chopin.mp3

and then type reboot, no playing. I SSH into /mnt/usb, no files found! only two . & .. directories date to 1970. I did check the file after VI editting.

Also I tried the webserver instruction :
http://wiki.chumby.com/mediawiki/index. … web_server

same! all files and debugchumby are gone.

Is there any command in device file system automatically erase all files in USB during start? also I tried reset button, the same result.
BTW: My device is Chumby Classic, 
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HW: 3.7
SW: 1.7.2
FW: 1830
HW#: CC07C06520

Control panel ver: 2.8.47
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Just want to start my music at startup. Any advice appreciate!

_____________ Summary as suggested by replies below_____________

1. use "sync " to write back to usb physically
2. Not playing my Inet music was due to false name: "debugchmuby", should be debugchumby
3. So file in USB should be:

#!/bin/sh                                                                       
btplay http://my.link.url:8000/music

4. The music should be heard during the bar flashing/loading (of control panel)
_______________________________
5. For such debugging, better always open ssh, i.e.
touch /psp/start_sshd

More details check:
- http://wiki.chumby.com/mediawiki/index. … mby_tricks
- http://wiki.ladyada.net/chumbyhackerboard/audio