Just thought you should be aware the Commodore PET and C64 floppy drives had, and may still have, a serious bug when saving a file from BASIC using the Save-with-Replace command([email protected]). Doing so would often corrupt the file/disk. https://www.atarimagazines.com/compute/issue65/save_with_replace.php   I never owned one of these computers/drives myself but encountered it on my brothers Commodore PET in 1979, believe it was a 2040 dual drive, before I got an Atari 400 a year or two la