A very simple but crude way of doing it would be to write a small batch file that does a "dir" on the drive you want, then schedule it as a task to run every 24 hours.
For example, put the following into a file called diskcheck.bat (change the drive letters accordingly) -
c:
cd\
echo %date% %time% >> c:\diskcheck.txt
dir > c:\dctemp.txt
findstr /i "Dir(s)" c:\dctemp.txt >> c:\diskcheck.txt
Echo'ing the time/date enables you to see when it was run. The findstr command looks in the dctemp.txt temporary file for the line that has the disk space remaining listed, so you don't get all the other crap in your end text file.
HTH
Chris