Hello all, I am using root 3.05/02 with Geant4.4.1.p01. In an exercise of poor judgement I hope not to repeat, I was running a simulation with many tens of millions of events and without saving my data in the interim. The bad news is that a power loss occurred during a run; the good news is that the root file was in the process of being written. When I viewed the file, root had to "recover" the file: TFile f("simset75.root") Warning in <TFile::Init>: file simset75.root probably not closed, trying to recover Info in <TFile::Recover>: recovered key TList:StreamerInfo at address 64132996 Info in <TFile::Recover>: recovered key TTree:CrystalTree at address 897651719 Warning in <TFile::Init>: successfully recovered 2 keys I then view the file in a TBrowser, and all appears well. I was hoping someone out there might be able to help me with these questions: What did the recovery program do and are there any unexpected repercussions? If i should run into this in the future, is there a permanent recovery function? or should I write a function to extract the data and write a new TTree (so it does not have to recover the file each time)? Cheers! Mark
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