Repairing Disk with First Aid
Uncommon issues like the fast forward/rewind functions can often be fixed by performing First Aid.
First Aid is different on Mac OS X 10.10 (Yosemite) or lower. For First Aid on older OS versions, see Disk Permissions Repair.
Open Applications, click Utilities and select Disk Utility.
Select the startup disk from the list of hard drives. By default this should be Macintosh HD.
Click First Aid.
Click Done once the verification process is complete.
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