To run chkdsk in Recovery Mode, follow the below steps:
1. Shut down your computer if it's not already turned off.
2. Turn on your computer and immediately press the F11 key repeatedly until the "Advanced Startup Options" screen appears.
3. Select "Troubleshoot" from the options and then click on "Advanced Options".
4. Click on "Command Prompt".
5. When the Command Prompt opens, type "chkdsk /r" (without quotes) and then press Enter.
6. Chkdsk will scan your drive and attempt to repair any errors it finds.
It's important to note that running chkdsk can take some time depending on the size of your drive, so be patient and let it complete the process.