Hi
Its Corsair 32 GB Pen drive with NTFS after the update from _2 to _4 it stopped working
There has been zero change related to USB disk behaviour between _2 and _4. Chances are your filesystem is simply corrupted. Plug it to a PC and run a chkdsk on it to repair it. Then, make sure you eject it using Safely Remove, and plug it back on the router.
You will have to monitor the system log at /tmp/syslog.txt while plugging a disk to see what happens, as I have no idea why that could happen beside a filesystem-level problem with the plugged disk.
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