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.
I read in several places that using hard drives with USB OTG was possible with Samsung Galaxy phones because Samsung reads NTFS-formatted drives. (I have an A9 Pro.)
But while I could use flash drives and micro-SD cards up to 200GB, I could not get NTFS-formatted external hard drive to work, with or without powered hubs.
Until...I prepared a WD Passport 2T drive, yes 2 terabyte.
How did I do it? I reformatted using exFAT. That's it. Then no powered hub, no lag, no overheating. No problems at all.