12.2 DOS Troubleshooting Issues
12.2.3 Invalid directory errors
There are a few instances where invalid directory errors may appear. These occur while attempting to navigate through the file system in DOS. For example, a hard drive contains two partitions and the first partition has been formatted but the second partition has not. Attempting to access this second partition drive letter will result in an "invalid directory error". This error will also appear when trying to access a directory that has been deleted or damaged and therefore can no longer be accessed. If the system has been backed up, recopy the directory to the hard drive and access it again.