How do you recover a partition with boot blocks rendered nonbootable? There was a split-second power outage during a high-wind event that damaged the root partition, rendered it nonbootable.
I built the computer in June 2011, one of the early UEFI-capable motherboards. I was able to recover the file system with fsck_ffs (ffsv2, I believe) but not make it bootable again. User data on /home partition was recovered all intact. I also have a NetBSD installation on the other computer (June 2013) NetBSD version is 9.99.82 amd64, which I also have on the other (June 2013) computer. I also have NetBSD 9.99.82 on each computer for both amd64 and i386. I tried to rebuild the OS to NetBSD-current amd64 from i386 installation. That was working up to the install stages, when build was stopped due to lack of entropy at 9 hours 10 minutes (not a selling point for NetBSD). The affected partition can be mounted and read, but when I try to boot, the computer immediately reboots, no error messages. I normally boot with a version of the Super Grub2 disk image. When, at the grub2 command prompt, I type "knetbsd /netbsd-99982" and then "boot", computer immediately reboots with no error message. I also tried to boot by UEFI but could not even get that to set up right. I read "man boot" many times. I checked /boot and /usr/mdec, even ran installboot from NetBSD-i386 installation, but nothing worked. Is there any way to recover? Tom
