Originally Posted by prowler
I think it just reads a sector at a time and overwrites the old data with the new, even if the new data is less reliable than the old.
What you describe as a better alternative (i.e., adding reliable data from each read to past reads) sounds more like very expensive forensic quality disk imaging software!
Not fully, no. I think it does keep some - Green sectors, at least.
Very expensive as in hundreds or as in thousands?
Originally Posted by Photon
You might have told us your setup at the start, we're not psychic
I guess known good disks read fine? I.e. write a disk, read it back, compare - or similar. I guess you're reading Amiga disks written on an Amiga and not with the CW? Were they written on DD disks or HD disks? If HD, is the HD-hole still covered?
Just wondering how you have reached the tentative conclusion that all your old disks are duff.
Tell us more.
I humbly apologize for not being perfect.
I've got no known good disks. Yep; old amiga 500 stuff. They've got one hole on the upper right, so DD, I think. I used to know that stuff...
Went through a bunch quick. Fields of red with patches of yellow, maybe green.
Originally Posted by chiark
^^^^^This +1. +1 again. And then + another 1.
Seems to be worse with PCs, but I have seen this with Amiga, too. Drives fail.
I ran a disk through 99 retries; the drives not faulty. It's not necessarily a good floppy drive, but it's not damaging. I think. There's no scratches, anyway. Just shiny disk.