Is it possible to use external hard drives with USB OTG? On some sources I have read that it is impossible to use external hard drives over USB OTG.
Is it really impossible?
Isn't there some kind of workaround?
Update: Apparently ES file explorer can see the disk but can't open it. I heard there are such issues with NTFS hard drives on Android.
Absolutely possible, I do this almost every day. You need to have an otg dongle (not just a cable) that permits adding an external power source. I use a dongle I bought on amazon for £12 and normal usb battery pack. Then I can load films onto my phone from a 2tb WD passport.

Without the additional power source you are not able to read the drive as your phone (or tablet) can't output enough current to properly operate the HDD.