hdiutil convert shortusername.sparseimage -format UDRW -o shortusername.dmg

https://discussions.apple.com/thread/2252244

hdiutil attach -nomount -readwrite -noverify -noautofsck “/Volumes/<TM backup name>/<mybackupname>.sparsebundle”

http://thefunkstop.com/fix-corrupted-time-machine-backups/ https://apple.stackexchange.com/questions/81093/what-are-next-steps-when-fsck-reports-could-not-be-repaired-after-3-attempts http://www.usr-local.org/wiki/doku.php/docs/tips_n_tricks/max_os_x/fix_time_machine_sparsebundle_errors https://apple.stackexchange.com/questions/18482/repair-time-machine-sparsebundle-that-will-no-longer-mount http://tonylawrence.com/posts/unix/fixing-corrupted-time-machine-backups/ https://www.garth.org/archives/2011,08,27,169,fix-time-machine-sparsebundle-nas-based-backup-errors.html

https://perrohunter.com/repair-a-mac-os-x-hfs-partition-table/ http://fillwithcoolblogname.blogspot.com/2011/04/repairing-mac-hfs-partition-table.html