Not so bad, SD cards can be robust. It depends on the file-system and how much work the controller does to catch errors, mark bad cells, etc. I have a few port

Not so bad, SD cards can be robust. It depends on the file-system and how much work the controller does to catch errors, mark bad cells, etc. I have a few portable handy recorders, a Zoom, a Tascam and a Sound Devices, and all of them handle the same SD cards for years, rarely complaining about format errors or losing files.