Now it gets even more curious..
I took a sample of 5 floppies which reported track errors during the test in excess of single track errors..
these ranged from 2 to 5 errors per floppy and performed the same process as above on each ..
some floppies required 2 passes.
All five now read as good and passed the test just fine ...twice..
These were left overnight and tested again this morning ..
All 5 passed with all 80 tracks reporting 'good'.
I will put these aside and test them again in a few days.
This action does at least apppear to restore floppies which on visual inspection through the shutter door show no physical defects or scratches to the magnetic surface.
what is going on ??
Perhaps in some way the action of writing flux patterns to the disk surface changes the magnetic properties and creates a fix/restore situation...if that's even possible ?
A sort of localised 'degausse'
Only time will tell.
rgds
VS
I took a sample of 5 floppies which reported track errors during the test in excess of single track errors..
these ranged from 2 to 5 errors per floppy and performed the same process as above on each ..
some floppies required 2 passes.
All five now read as good and passed the test just fine ...twice..
These were left overnight and tested again this morning ..
All 5 passed with all 80 tracks reporting 'good'.
I will put these aside and test them again in a few days.
This action does at least apppear to restore floppies which on visual inspection through the shutter door show no physical defects or scratches to the magnetic surface.
what is going on ??
Perhaps in some way the action of writing flux patterns to the disk surface changes the magnetic properties and creates a fix/restore situation...if that's even possible ?
A sort of localised 'degausse'
Only time will tell.
rgds
VS