Problem to initialize USB Drive

I was using a USB Drive for dupicate backup using Backup Exec with Windows Server Standard 64Bit. Not sure what happened – the drive now appears as Not initialized and I do not have the option to intialize it. So I attached it to a laptop and formatted the USB drive. The laptop recognizes the USB drive and I can store files on it when connected to laptop. BUT – When I reconnect the same USB drive to the server it is not useabe and in computer management – it appears as not initialized?

Any suggestions would be appreciated.