All modern 3.5" HD floppies are pretty much crap. Brand new out of the box, they will format fine and a few weeks later develop bad sectors. Its not the floppy drives either. What I can't figure out is why my disks from the mid 90s are all fine, but anything from around 1998 or so is completely toast. Its frustrating when I have to boot a machine that only uses floppies only to have to go through a pile of 10-15 disks to find 1 good one. Imaging programs like DiskCopy are very unforgiving too. A hint of a bad sector and they spit out the disk.