Stop using the pendrive immediately
Do not copy new files to it
Check the Recycle Bin on the computer if the files were deleted after copying
Use file recovery software such as Recuva, PhotoRec, EaseUS Data Recovery Wizard, or Disk Drill
Install the recovery software on a different drive, not on the pendrive
Connect the pendrive to the computer
Run a deep scan on the pendrive
Preview the recoverable files
Select the files you want to restore
Save the recovered files to a different drive
If the drive is not detected, try another USB port or another computer
If the pendrive shows errors, run a disk check before recovery
If software recovery fails, contact a professional data recovery service
Avoid formatting the pendrive until recovery is complete