I have gotten whole cases of CD-R’s at yard sales and thrift stores. I do not own a single CD-RW. Even when I purchase them, the CD-R’s are so cheap that if I mess up I can just toss the error and still come out ahead. If I needed to overwrite it frequently I would probably just use a different media if available (like a USB drive).
Might be a bit narrow, but if you wanted to make some pickle spears it should work.
I like to do a fridge pickle (always gets eaten within a few weeks, so spoilage isn’t a huge concern). Something like this pickled jalapeño recipe works with most veggies, and you can use some whole black peppercorn and mustard seeds (or a pickling spice mix) to give it that pickle flavor.