title: MongoDB old Databases & collections not accessible - Mongod.exe and Mongo.exe running
body: <p>I'm a MongoDB beginner. </p>
  
  <p>I'm working on Intellijidea IDE to develop JAVA program in the aim to execute data mining processes on social media like Twitter and Facebook, based on Twitter4j and Facebook4j.</p>
  
  <p>I use MongoDB to store database collections for test and evaluation purposes. I have saved several MongoDB databases, which were all accessible until a few days, in a folder as E:/data/db. So, all my previous databases are accessible in E:/data/db and I can easily control the structure of the databases collections through a terminal command in windows shell (show dbs(), show collections(), db stats()).</p>
  
  <p>Last week, I launched a new data mining database collection, with several collections, and probably made a mistake in the localization of the database on my computer, where I put the new database in E:/data/db/newdatabase.</p>
  
  <p>The problem is that I need to get the data mining process running while I would like to analyze the old databases collections through the R software.</p>
  
  <p>Right now, I'm not able to access to the old MongoDB databases on Windows terminal command, as I can see only that there is some bytes, but no structured collections etc… When I'm trying to call the collections and the databases from R with rmongodb package, I'm not able to see the previous collections.</p>
  
  <p>Might I be able to restore the old databases collections with Mongo restore or something like that ? What Kind of mistake could I have done to keep these old databases collections not accessible while there were a few days ago ?</p>