Hello, my hard drive can't be mounted anymore. Two days ago the drive was very slow (<1kb/s read and write, but I didn't find any errors anywhere). However after unplugging and plugging in again, everything seemed normal again, so I don't know if that's related. When trying to mount it today I get that error: mount: /mnt: wrong fs type, bad option, bad superblock on /dev/sdb, missing codepage or helper program, or other error. Mounting without -o results in dmesg: [14479.650956] BTRFS info (device sdb): disk space caching is enabled [14479.650963] BTRFS info (device sdb): has skinny extents [14499.742007] BTRFS error (device sdb): parent transid verify failed on 3437913341952 wanted 7041 found 6628 [14499.753076] BTRFS error (device sdb): parent transid verify failed on 3437913341952 wanted 7041 found 6628 [14499.753089] BTRFS error (device sdb): failed to read block groups: -5 [14499.816157] BTRFS error (device sdb): open_ctree failed I already tried mounting with usebackuproot,nospace_cache,clear_cache, but that resulted in the same error messages as before. When running btrfs check I get the output: parent transid verify failed on 3437913341952 wanted 7041 found 6628 parent transid verify failed on 3437913341952 wanted 7041 found 6628 parent transid verify failed on 3437913341952 wanted 7041 found 6628 Ignoring transid failure ERROR: child eb corrupted: parent bytenr=3437941538816 item=123 parent level=2 child level=0 ERROR: failed to read block groups: Input/output error ERROR: cannot open file system From what I've read so far, running btrfs-zero-log or btrfs check --repair may help, but it may also do more damage then good, so I'd rather ask then make the situation worse then it already is. kernel 5.6.11 btrfs-progs 5.6 Regards, Christoph
