Back to the Floppy (2019)
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Around the early days of windows 3.11, someone figured out how to make cheaper 3.5" disks and putting data on off-brand disks became a gamble.
Enticed by the low price, I bought several boxes of ten floppy disks that had plastic shutters instead of metal. A few from each box of ten had bad sectors from new.
I end up trying to only use TDK disks, though later in the 1990s it seemed to me that the quality of new 3.5" floppy drives went down as well.
Also, it's interesting how an Amiga can boot off of a floppy faster than most modern computers can boot from an SSD. Floppies required people to be deliberate about loading files. It's a lesson I think most of us have forgotten now that a web browser can be a few hundred megabytes on disk.
For the fun of it, not long ago I loaded all the DMF (1680K) floppy images for Windows 98 onto a USB stick for a FlashFloppy, booted the boot disk in PC-Task on an Amiga 3000 (with original m68030), then proceeded to install Windows 98. It's amazing that a modern device can emulate a floppy drive, that the Amiga could read the emulated floppy whatever the data rate (Amigas can't do HD floppy data rates, so Amigas cheated by using drives that could run at half the RPM), and could even support the 21 sectors per track that Windows 98 DMF disks use. Of course, it can be done with real floppy disks, too.
Floppies are cool :)
If your system is fine, and your data is on the floppy according to your friend's system, too, then the issue was most likely the library's system. That's not a floppy issue ;)
Oh, and I had enough problems with floppies loosing data too. Especially the newer disks, the older ones were better but the new packages I could throw 10-20% of the floppies.
Kids these days just push to a code repo and call it good - they'll never know the joy of seeing "unreadable disk" scrawled in red on their code listing when they get their assignment back.
I recently started burning CD's again for my car's 6-disc changer... it's comforting having variety, but structured/patterned (I also use Pandora's random stations music service).
I would, but I can't. :-)