Please review at your convenience. https://bugs.openjdk.java.net/browse/JDK-8182710 http://cr.openjdk.java.net/~bpb/8182710/webrev.00/
The listRoots() method invokes the GetLogicalDrives() Windows function [1] which may set the bit for a CD’s logical drive even if no CD is currently inserted which also means that the root at which the CD file system would exist were a CD inserted is included in the returned list even though that file system location does not actually exist. This change eliminates including any locations implied by a set bit in the return value of GetLogicalDrives() if that location does not exist. Thanks, Brian [1] https://msdn.microsoft.com/en-us/library/windows/desktop/aa364972(v=vs.85).aspx
