per
Veteran Member
I am going through and once and for all properly archiving my collection of floppy disks, and from time to other I come across 48tpi disks with a peculiar 128-byte FM-modulated tag on head 0 of the 41st cylinder. Sometimes it is also accompanied by empty tags on head 1 and both heads of the 42nd cylinder as well, which you can see in the attached screen capture.
This got me curious. Are any of you familiar what this was used for? My guess is that one particular type of master-disk copier would add such a tag as a signature, but I see quite similar tags on different disks from different software companies. I also see that sometimes, if there are many disks in a software product and there are tags like this, not all of the disks may have the tags.
This got me curious. Are any of you familiar what this was used for? My guess is that one particular type of master-disk copier would add such a tag as a signature, but I see quite similar tags on different disks from different software companies. I also see that sometimes, if there are many disks in a software product and there are tags like this, not all of the disks may have the tags.
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