Not all my files will transfer from Int HD to Ext USB

[VegazSteve032]

Im trying to move files from my Internal HD (HP Envy 1019NR) to a 2TB ext USB. During the transfer, the window shows the files moving, est duration and all. When the file transfer is complete, a look at the "properties" of the new file is, to say, a joke.
For example, a file/folder sized at 3.5GB moved and the new folder shows 411MB.

I've also had issues with moving files to my (android,Galaxy S5) phone as well.

I'm thinking its a fault with the USB reader in the laptop itself, but not completely sure. Where would I find this part and what should I be looking for?
Any help would be greatly appreciated.
Thank you
Steve

 

[Boogieman_WD]

Hey there, VegazSteve032.

Do you hear any strange noises coming either from the external drive or the internal one (the laptop's HDD)? Basically you should be getting errors if a file or more can't be transferred.

Since you're having issues with a different external device as well, you should direct your attention to the laptop and the internal drive more specifically, although it would be a good idea to try the external drive with a different USB cables and a different computer to see if the same thing happens again. Other than that, I'd recommend that you backup the internal drive's data (even in small chunks if you have to), just to be on the safe side. When this is done, I'd suggest that you download an HDD diagnostic tool and test the drive for errors and bad sectors, to see if there's anything alarming. You could also test the external drive as well.

Please let me know how everything goes.
Boogieman_WD