Is your Usb drive not working on your MacBook ? You are worried about the stored data in the drive and want to recover data after Macbook does not recognize usb. The drive can be unrecognized if has been corrupted and the file system is damaged. It can happen mostly when you have accidentally removed the drive from the system. The partitioning process was interrupted with some error, the drive is filled with junk files or is infected with virus program. To recover data after macbook does not recognize usb first you have to fix the drive corruption by formatting the drive. Even so the data has been erased it can be recovered by using any backup source. You can look if time machine can get your files back. But if the time machine fails then you can use the Mac data recovery software to scan the usb drive and then the software will show you the list of files it found for recovery. You can select the files you need and recover data after macbook does not recognize usb. So download the software and make use of it.