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

The timer bug can be reproduced with this code:

var fs;
var interv;
var t=-1;
var rh=-1;



function onInit() {
    setTimeout("doInit();",2000);
}

function doInit() {
    fs=require("fs");
    fs.appendFile("timetemp.log","Espruino restarted")
    interv=setInterval(function(){dologs();}­,5000);
    setBusyIndicator(A13);
}

function dologs() {
    console.log("trying to log..."+getTime().toFixed());    
    var ti = getTime();
    if (!fs.appendFile("diskerrator.log","DHT11­,"+t.toString()+","+rh.toString()+",Time­,"+getTime().toFixed()+"\n")){
        console.log("FAIL before "+ti+" after "+getTime());
    }
}


save();

Ran it overnight, and woke up to it broken. Manually cleared the interval, and typed getTime() a few times. These were typed a couple of seconds apart at most:

ERROR: Unable to write file : DISK_ERR
FAIL before 45778185.87560272216796 after 45778190.38722991943359
trying to log...45778199
ERROR: Unable to write file : DISK_ERR
FAIL before 45778211.53864669799804 after 45778216.05158138275146
trying to log...45778225
ERROR: Unable to write file : DISK_ERR
FAIL before 45778237.20124530792236 after 45778241.71224975585937
trying to log...45778250
ERROR: Unable to write file : DISK_ERR
FAIL before 45778262.85095405578613 after 45778267.36160087585449
trying to log...45778276
ERROR: Unable to write file : DISK_ERR
FAIL before 45778288.36543083190917 after 45778292.84815883636474
trying to log...45778302
ERROR: Unable to write file : DISK_ERR
FAIL before 45778314.20237731933593 after 45778316.91917991638183
trying to log...45778319
ERROR: Unable to write file : DISK_ERR
FAIL before 45778324.45648479461669 after 45778326.43975925445556
trying to log...45778329
ERROR: Unable to write file : DISK_ERR
FAIL before 45778333.97615909576416 after 45778336.01252174377441
clearInterval(inter);
=undefined
getTime();
=45802702.42679214477539
getTime();
=45814433.28411769866943
getTime();
=45828450.28250503540039
reset();
=undefined
 _____                 _ 
|   __|___ ___ ___ _ _|_|___ ___ 
|   __|_ -| . |  _| | | |   | . |
|_____|___|  _|_| |___|_|_|_|___|
          |_| http://espruino.com
 1v58 Copyright 2014 G.Williams

=undefined
>getTime();
=46298892.14406204223632
>getTime();
=46307856.84639739990234

(in above, I had to remove the > prompt, otherwise the forum mangled it)

Last entries in the log:

DHT11,-1,-1,Time,11087
DHT11,-1,-1,Time,11092
DHT11,-1,-1,Time,11097
DHT11,-1,-1,Time,11102
DHT11,-1,-1,Time,11107
DHT11,-1,-1,Time,11112
DHT11,-1,-1,Time,11117
DHT11,-1,-1,Time,11122
DHT11,-1,-1,Time,11127
DHT11,-1,-1,Time,11132
DHT11,-1,-1,Time,11137
DHT11,-1,-1,Time,11142
DHT11,-1,-1,Time,11147
DHT11,-1,-1,Time,11152
DHT11,-1,-1,Time,11157
DHT11,-1,-1,Time,12697
DHT11,-1,-1,Time,12697
DHT11,-1,-1,Time,12697
DHT11,-1,-1,Time,12697
DHT11,-1,-1,Time,12697
DHT11,-1,-1,Time,12697
DHT11,-1,-1,Time,16339
DHT11,-1,-1,Time,16339
DHT11,-1,-1,Time,16339
DHT11,-1,-1,Time,16339
DHT11,-1,-1,Time,16339