Backups.backupdb folder is greyed out on my external time machine drive I use two separate backup drives to backup my iMac and MacBook.  I call one drive Time Machine and the other drive Mobile.  On Mobile, it shows a folder called Backups.backupdb and inside it has a folder for the iMac and the Macbook.  On the Time Machine drive it has the same folder but it is greyed out.  When I click on it to try and verify the two folders inside of it, nothing happens.  Any thoughts on why this is happening?

Thanks!
This is a time machine backup that never completed.  The only way to get rid of it is to use Disk Utility and erase the drive and reformat it.  Sorry.