Hi all, thanks for responding.
Addition, just couldn't resist:
Ste2: pastifying normal (non-original) disk: no scratches. Pastifying another original - no scratches. Pastifying the next original , again scratches (all damaged originals are from different atari packs. ). Maybe there are some disks that do scratch and some that don't. Maybe other people noticed the same.
The damaged disks are:
2 Atari compilation Menu disks (red/white label similar to the Atari Discovery compilation: disk one: Moon Patrol/Mousetrap and disk two: Beyond the Ice Palace and Thundercats this Pack has 5 disks), me and others over at Atarimania couldn't find the corresponding Atari compilation. 2 disks from that compilation are sold on ebay here:http://cgi.ebay.de/ATARI-ST-Floppy-SF31 ... 255889e142
the 2 disks on the left. We've got the 2nd disk on the left but not the first. So if anyone has got it or at least could decifer whats on it... (the only thing I can read on the photo is a "1"). Maybe someone knows this compilation or has got it and can preserve the rest of the disks. Maybe someone of the German crowd may remember that compilation.
And 3 Atari "Powerpack 4" disks are non-readable (white disk, white label) containing Matahari, Space Racer and Hostages. But I managed to pastify one original from this pack without scratches: Turbo Cup.
I still think pastifying all remaining originals is a good idea, that's why I wanted to preserve my collection in the first place. But in my experience, there are disks that may not survive the process. They may not have been the best quality disks when they were sold, since they were in budget compilations. They may also have been too old or just badly stored (to me they looked flawless, but you can never be sure of the condition of the magnetic surface, even if it looks perfect).
There are other originals that I pastified without scratches on the same machine while these compilation disks get shredded. Some compilation disks get these scratches and are still playable some are completely destroyed. The problem is not limited to one machine, but three, one of which never got in contact with "contaminated" disks.
Anyway, I will not use pasti on these disks anymore, but I encourage others to still use it and pastify as many disks as possible. Just before you use pasti the next time, check the magnetic disk before and after. Maybe it's a recurring problem. Maybe someone with more insight than me should look into it.
By the way, is there a remote chance to write my pasti files back onto disks? I got a usb floppy drive (pasti works with that), since my board does not support my old internal floppy drive anymore.