"The drive cannot find the sector requested" - External hard disc is not working. Please help me

WD External Drives WD Portable Drives
2

Hello allenarun, it appears that the files are corrupted, you should be able to recover most of them with a data recovery program. Using Google you can find several options. Also check if the link below helps. 

http://community.wd.com/t5/External-Drives-for-Mac/MyBook-initializing-error-cannot-first-aid-repair/m-p/488778/highlight/true#M6507