Bitcoin QT finished syncing this weekend after d/l for Windows 7 on Thursday.

Today, probably 2nd or 3rd time running it, an error came up right away that index could not be found.

What would cause this to happen, and why would it have to reindex all the blocks on disk?

Thanks, Mike

  • Did you recently do a non-clean shutdown? (Crash, power loss, etc) Apr 16, 2013 at 22:19
  • Running a rescan might help: bitcoin.stackexchange.com/a/7734/516 Apr 17, 2013 at 1:15
  • -rescan checks for missing wallet transactions. The error here is because a database sanity check at startup fails, where the wallet isn't even touched yet. Jun 16, 2013 at 22:56

1 Answer 1


When I've had this happen it's been because of a non-clean shutdown. Something about the disk state ends up being inconsistent and this (understandably) results in the system wanting to verify all the information it has on disk.

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