I use 12x cdrws to do a temporary back up and have around 20, which I try to rotate.
Whilst doing some testing using CDSpeed on cdr media I ran one of the cdrws burnt in Nero through and to my horror it showed 3.05 Million errors! I did a full erase and reburned it in CloneCD and it showed 5.4 Million errors. I don’t keep a record of the number of times each cdrw is used but it would have to be less than 15 burns in total.
I subsequently did burns on 2 mint cdrws and they showed zero errors.
I have not had a chance to try the other previously used cdrws as I don’t retain data on them, always erasing them immediately after transferring the contents.
Although my Lite-on and Pioneer drives had no problem reading the disc, my advice is to check your cdrws for errors before relying on them for medium or long term storage.