I think a nice feature would be to add defrag software to the R15. This may reduce the need to reformat as much. And this would clean up the drive without losing what is recorded on it. I've had my refurbished R15-500 for about 3 months and have not had problems until recently. It now freezes while viewing some recorded programs, etc. I have had to reset it about 5 times today. So I think I need to get all the programs I want to keep saved to my VCR and reformat.