Attaching external USB drive to Chromecast w/google tv

[rider]

I'm trying to attach an external usb drive to Chromecast w/google TV (4k). The drive is formated in FAT. It worked in the beginning but now Chromecast always shows the drive is safely ejected (no matter how many times I unplug and plug the drive back in). The strange thing is the drive is correctly recognised by Chromecast (the volume name is displayed properly).

Any suggestion for a solution? Thanks.

[MagicAndre1981]

maybe the drive is using too much power. Which kind of USB hub do you use? Does it provide enough power to handle external drives? 

[rider]

The drive has it own power input, so I don't think power is the issue.