ERROR: Unable to write file : DISK_ERR, leads to Out of Memory errors.

setTimeout("doInit();",2000);

change to:

setTimeout(doInit,2000);

then it works on my Espruino.
setTimeout() don't like a string, then it don't call doInit() and therefor it don't require fs and we get DISK_ERR
Edit:
It only reached 102 before DISK_ERR came back. Then there was a 30 DISK_ERR before continuing.