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I formatted a new disk and it worked, but it took a long time and a large amount of the disk was bad sectors
Explanation: You are trying to format a floppy disk and the format succeeds, but a great deal of the disk is consumed by what the format program says are bad sectors--typically a quarter of the disk or more.
Diagnosis: This problem usually results from using poor-quality or the incorrect type of media in the drive. In particular, sometimes people play games with disks, trying to format cheaper disks as high density. As described here, however, the different media use different chemistry and cannot be interchanged. So the format will limp along and sort of work--except that not only is much of the disk lost to "bad sectors", whatever actually is written to the disk will probably become corrupted relatively quickly as well. If this problem occurs even when using the right type of media, the drive itself is probably at fault.