Evan, if you are running CP/M there is a program called findbad that locks out bad sectors. Alex B ----- Original Message ----- From: Evan Koblentz via vcf-midatlantic <vcf-midatlantic@lists.vintagecomputerfederation.org> To: vcf-midatlantic <vcf-midatlantic@lists.vintagecomputerfederation.org> Cc: Evan Koblentz <evan@vcfed.org> Sent: Wed, 19 Apr 2017 00:27:26 -0400 (EDT) Subject: [vcf-midatlantic] Bad disks I went to format 5.25 disks from a NOS box still in shrink wrap. There were 11 disks in the box ("pay for 10, get one free"). Every disk resulted in a track error at a different track. If you can't trust never-opened disks to be good, then how do you acquire disks? Is there any good software to repair the errors? ________________________________ Evan Koblentz, director Vintage Computer Federation a 501(c)(3) educational non-profit evan@vcfed.org (646) 546-9999 www.vcfed.org facebook.com/vcfederation twitter.com/vcfederation instagram.com/vcfederation