Please check the file system of the External Hard Disk. For ex, FAT 16 or FAT 32 or NTFS or ExFAT . And please check your OS. Some of the file systems are not recognised by Linux OS based PCs depending upon the version of the Linux OS and so on. Basically, if your TV detects your External Hard disk, there is nothing that should stop it from getting connected to your PC/Laptop. It is quite evident that your Hard disk is not faulty as you have mentioned that you can access it over your TV One thing to do is to update the drivers of the USB3.0 and USB 3.1 Ports on the motherboard of your PC/Laptop. That is one issue which can stop it from getting detected on your PC/Laptop.

If you had used a password to secure your WD Password, you did it probably because you didnt want anyone else to see the contents which you had stored inside the WD Passport External HDD. The problem with WD Password is that you cannot retrieve the password once it is forgotten. The WD Security password protection is a 256-bit AES encryption system . Not even the customer care can offer a solution. The reason is that there is hardware level encryption in the WD Passport.The Only solution left is that you will have to forget about what was there in the hard disk if you forgot your password and start afresh. One can reformat the hard disk with the Erase option available in the WD Unlock Tool. Once you use the Erase Tool, whatever data that was there in the HDD till now will be gone forever. You will not be able to retrieve it. After you have formatted the Hard Disk, you can start dumping whatever data it is that you find crucial again into your freshly reformatted WD Passport. Please Note : It is really hard...

If your External HDD is a WD Passport, it has extra hardware that does the encryption part. The data transfer is slow probably due to improper handling like a fall or pulling off the Ext HDD while iti s still running and hasn't spinned down. (multiple times)